+(decode
+"Subject: = =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: = \e$B$"\e(B")
+
+(decode
+"Subject: =? =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =? \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP? =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP? \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B? =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B? \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI= =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI= \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=? =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=? \e$B$"\e(B")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?= =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: \e$B$"$"\e(B")
+
+(decode
+"Subject: ==?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: ==?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?=="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?==")
+
+(decode
+"From: akr@jaist.ac.jp (\\=?ISO-2022-JP?B?GyRCJCIbKEI=?=)"
+"From: akr@jaist.ac.jp (\\=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+(decode
+"=?ISO-2022-JP?B?GyRCJCIbKEI=?=: test"
+"=?ISO-2022-JP?B?GyRCJCIbKEI=?=: test")
+
+(decode
+"=?ISO-2022-JP?B?GyRCJCIbKEI=?=: test"
+"=?ISO-2022-JP?B?GyRCJCIbKEI=?=: test"
+'permit-sticked-special)
+
+;;; Section 3: Decoding melancholic inputs.
+
+(decode
+"From:=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+"From:\e$B$"\e(B <akr@jaist.ac.jp>")
+
+(decode
+"From: akr@jaist.ac.jp\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\\a=?ISO-2022-JP?B?GyRCJCQbKEI=?=)"
+"From: akr@jaist.ac.jp (\e$B$"\e(B\\a\e$B$$\e(B)")
+
+(decode
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>")
+
+(decode
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>")
+
+(decode
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>"
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>")
+
+(decode
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+"From: (a)\e$B$"\e(B <akr@jaist.ac.jp>"
+'permit-sticked-comment)
+
+(decode
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>"
+"From: \e$B$"\e(B(b) <akr@jaist.ac.jp>"
+'permit-sticked-comment)
+
+(decode
+"From: (a)=?ISO-2022-JP?B?GyRCJCIbKEI=?=(b) <akr@jaist.ac.jp>"
+"From: (a)\e$B$"\e(B(b) <akr@jaist.ac.jp>"
+'permit-sticked-comment)
+
+(decode
+"From: \"a\"=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+"From: \"a\"=?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>")
+
+(decode
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=\"b\" <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=\"b\" <akr@jaist.ac.jp>")
+
+(decode
+"From: \"a\"=?ISO-2022-JP?B?GyRCJCIbKEI=?=\"b\" <akr@jaist.ac.jp>"
+"From: \"a\"=?ISO-2022-JP?B?GyRCJCIbKEI=?=\"b\" <akr@jaist.ac.jp>")
+
+(decode
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)\r
+ <akr@jaist.ac.jp>"
+"From: \e$B$"\e(B(\e$B$"\e(B) <akr@jaist.ac.jp>"
+'permit-sticked-comment)
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>")
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: \e$B$"\e(B<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(decode
+"To: <akr@jaist.ac.jp>,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: <akr@jaist.ac.jp>,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>")
+
+(decode
+"To: <akr@jaist.ac.jp>,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: <akr@jaist.ac.jp>,\e$B$"\e(B<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(decode
+"To: akr@jaist.ac.jp,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: akr@jaist.ac.jp,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>")
+
+(decode
+"To: akr@jaist.ac.jp,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+"To: akr@jaist.ac.jp,\e$B$"\e(B<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:akr@jaist.ac.jp;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:akr@jaist.ac.jp;")
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:akr@jaist.ac.jp;"
+"To: \e$B$"\e(B:akr@jaist.ac.jp;"
+'permit-sticked-special)
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<akr@jaist.ac.jp>;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<akr@jaist.ac.jp>;")
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<akr@jaist.ac.jp>;"
+"To: \e$B$"\e(B:\e$B$$\e(B<akr@jaist.ac.jp>;"
+'ignore-76bytes-limit 'permit-sticked-special)
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<foo@bar>,=?ISO-2022-JP?B?GyRCJCYbKEI=?=<foo@bar>;,=?ISO-2022-JP?B?GyRCJCgbKEI=?=<foo@bar>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<foo@bar>,=?ISO-2022-JP?B?GyRCJCYbKEI=?=<foo@bar>;,=?ISO-2022-JP?B?GyRCJCgbKEI=?=<foo@bar>")
+
+(decode
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<foo@bar>,=?ISO-2022-JP?B?GyRCJCYbKEI=?=<foo@bar>;,=?ISO-2022-JP?B?GyRCJCgbKEI=?=<foo@bar>"
+"To: \e$B$"\e(B:\e$B$$\e(B<foo@bar>,\e$B$&\e(B<foo@bar>;,\e$B$(\e(B<foo@bar>"
+'ignore-76bytes-limit 'permit-sticked-special)
+
+(decode
+"Subject:=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject:=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject:=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject:\e$B$"\e(B"
+'permit-sticked-special)
+
+;;; Section 4: Decoding invalid inputs.
+
+(decode
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?==?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?==?ISO-2022-JP?B?GyRCJCQbKEI=?= <akr@jaist.ac.jp>")
+
+(decode
+"From: akr@jaist.ac.jp\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=a=?ISO-2022-JP?B?GyRCJCQbKEI=?=)"
+"From: akr@jaist.ac.jp (=?ISO-2022-JP?B?GyRCJCIbKEI=?=a=?ISO-2022-JP?B?GyRCJCQbKEI=?=)")
+
+(decode
+"From: akr@jaist.ac.jp\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCQbKEI=?=)=?ISO-2022-JP?B?GyRCJCYbKEI=?=)"
+"From: akr@jaist.ac.jp (=?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCQbKEI=?=)=?ISO-2022-JP?B?GyRCJCYbKEI=?=)")
+
+(decode
+"From: akr@jaist.ac.jp\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCQbKEI=?=)=?ISO-2022-JP?B?GyRCJCYbKEI=?=)"
+"From: akr@jaist.ac.jp (\e$B$"\e(B(\e$B$$\e(B)\e$B$&\e(B)"
+'ignore-76bytes-limit)
+
+(decode
+"Subject: =?=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI==?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI==?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?=?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?=?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?==?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?==?ISO-2022-JP?B?GyRCJCIbKEI=?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI?="
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCNFg-dBsoQg==?="
+"Subject: =?ISO-2022-JP?B?GyRCNFg-dBsoQg==?=")
+
+(decode
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?= =?= =?ISO-2022-JP?B?GyRCJCIbKEI=?="
+"Subject: \e$B$"\e(B=?=\e$B$"\e(B")
+
+;;; Section 5: Encoding proper inputs.
+
+(encode
+"From: \e$B$"\e(B <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \e$B$"$$\e(B <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIkJBsoQg==?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \e$B$"\e(B \e$B$$\e(B <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEIgGyRCJCQbKEI=?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \e.A\eN! \eN! <akr@jaist.ac.jp>"\e*B
+"From: =?ISO-8859-1?Q?=A1_=A1?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \"\e$B$"\e(B(\e$B$"\e(B)\" <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEIoGyRCJCIbKEIp?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \"a\\\"b\e$B$"\e(Bc\\\\\" <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?YSJiGyRCJCIbKEJjXA==?= <akr@jaist.ac.jp>")
+
+(encode
+"Subject: \e$B0$\e(B \e$BR_\e(B"
+"Subject: =?ISO-2022-JP?B?GyRCMCQbKEIgICAgICAgICAgICAgICAgICAgICAgICAgICAg?=\r
+ =?US-ASCII?Q?____________________________________________________________?=\r
+ =?ISO-2022-JP?B?ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIBskQlJfGyhC?=")
+
+(encode
+"Subject: \e$B0$\e(B \e$BR_\e(B"
+"Subject: =?ISO-2022-JP?B?GyQpQrCkICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICDS3w=="
+'ignore-76bytes-limit 'ignore-75bytes-limit)
+
+(encode
+"From: \e.A\eN! <akr@jaist.ac.jp>"\e*B
+"From: =?ISO-8859-1?Q?=A1?= <akr@jaist.ac.jp>")
+
+(encode
+"From: \"abcdefghijklmnopqrst\e.A\eN!()\\\"\\\\\" <akr@jaist.ac.jp>"\e*B
+"From: =?ISO-8859-1?Q?abcdefghijklmnopqrst=A1=28=29=22=5C?= <akr@jaist.ac.jp>")
+
+(encode
+"From: akr@jaist.ac.jp (abcdefghijklmnopqrst\e.A\eN!\\(\\)\"\\\\)"\e*B
+"From: akr@jaist.ac.jp (=?ISO-8859-1?Q?abcdefghijklmnopqrst=A1=28=29\"=5C?=)")
+
+(encode
+"Subject: \e$B$"\e(B a \e.H\eN`"\e*B
+"Subject: =?ISO-2022-JP?B?GyRCJCIbKEI=?= a =?ISO-8859-8?Q?=E0?=")
+
+(encode
+"Subject: \e.H\eN`\e$BNm\e(B"\e*B
+"Subject: =?ISO-8859-8?Q?=E0?= =?ISO-2022-JP?B?GyRCTm0bKEI=?=")
+
+(encode
+"Subject: \e.H\eN` \e$BNm\e(B"\e*B
+'("Subject: =?ISO-8859-8?Q?=E0_?= =?ISO-2022-JP?B?GyRCTm0bKEI=?="
+ "Subject: =?ISO-8859-8?Q?=E0?= =?ISO-2022-JP?B?IBskQk5tGyhC?="))
+
+(encode
+"Subject: \e.F\eNC\e$B4X?t\e(B"\e*B
+'("Subject: =?ISO-8859-7?Q?=C3?= =?ISO-2022-JP?B?GyRCNFg/dBsoQg==?="
+ "Subject: =?ISO-2022-JP-2?B?Gy5GG05DGyRCNFg/dBsoQg==?="))
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa(\e$B$"$$\e(B)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: aaaaaaaaaaaaaaaaaaaaa(=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyRCJCQbKEI=?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>")
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa (\e$B$"$$\e(B)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'("From: aaaaaaaaaaaaaaaaaaaaa
+ (=?ISO-2022-JP?B?GyRCJCIkJBsoQg==?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+ "From: aaaaaaaaaaaaaaaaaaaaa (=?ISO-2022-JP?B?GyRCJCIbKEI=?=
+ =?ISO-2022-JP?B?GyRCJCQbKEI=?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"))
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa( \e$B$"$$\e(B)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'("From: aaaaaaaaaaaaaaaaaaaaa(
+ =?ISO-2022-JP?B?GyRCJCIkJBsoQg==?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+ "From: aaaaaaaaaaaaaaaaaaaaa( =?ISO-2022-JP?B?GyRCJCIbKEI=?=
+ =?ISO-2022-JP?B?GyRCJCQbKEI=?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"))
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa(\e$B$"$$\e(B )aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'("From: aaaaaaaaaaaaaaaaaaaaa(=?ISO-2022-JP?B?GyRCJCIkJBsoQg==?=
+ )aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+ "From: aaaaaaaaaaaaaaaaaaaaa(=?ISO-2022-JP?B?GyRCJCIbKEI=?=
+ =?ISO-2022-JP?B?GyRCJCQbKEI=?= )aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"))
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa(\e$B$"$$\e(B) aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: aaaaaaaaaaaaaaaaaaaaa(=?ISO-2022-JP?B?GyRCJCIkJBsoQg==?=)\r
+ aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>")
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaa(\e$B$"\e(B \e$B$$\e(B)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: aaaaaaaaaaaaaaaaaaaaa(=?ISO-2022-JP?B?GyRCJCIbKEIgCg==?=\r
+ =?ISO-2022-JP?B?GyRCJCQbKEI=?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From:\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From:\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)\r
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'separate-sticked-tokens-for-fold)
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)=?US-ASCII?Q?aaaaaaaaaaaaaaaaaaaaaaa?=\r
+ =?US-ASCII?Q?aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa?= <akr@jaist.ac.jp>"
+'encode-long-ascii-string-for-fold 'permit-sticked-special)
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ aaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'divide-atom-for-fold)
+
+(encode
+"From: (\e$B$"\e(B)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+'("From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <akr@jaist.ac.jp>"
+ "From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ <akr@jaist.ac.jp>")
+'ignore-76bytes-limit)
+
+(encode
+"From: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\e$B$"\e(B)aa <akr@jaist.ac.jp>"
+"From: =?US-ASCII?Q?aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa?=\r
+ =?US-ASCII?Q?a?=(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aa <akr@jaist.ac.jp>"
+'encode-long-ascii-string-for-fold)
+
+(encode
+"From: \e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\e$B$"\e(B)aa <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEIgYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYQ==?=\r
+ =?US-ASCII?Q?aaaaaaaaaaaaaaa?=(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)aa"
+'encode-long-ascii-string-for-fold)
+
+(encode
+"From: (\e$B$"\e(B) <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=) <akr@jaist.ac.jp>")
+
+(encode
+"From: ((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B)))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From: ((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From: (((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=)))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: ((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B)))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From: ((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B))))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From: (((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: ((((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B)))))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From:\r
+ ((((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: ((((((((((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B)))))))))))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From:\r
+ ((((((((((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From:\r
+ ((((((((((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (((((((((((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B))))))))))))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From:\r
+ ((((((((((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyhC?=(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: ((((((((((((((((((((((((((((((((((((((((((((((((((((((((\e$B$"\e(B)))))))))))))))))))))))))))))))))))))))))))))))))))))))) <akr@jaist.ac.jp>"
+"From:\r
+ ((((((((((((((((((((((((((((((((((((((((((((((((((((((=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyhC?=((=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))))))))))=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyhC?=))))))))))))))))))))))))\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: ()(\e$B$"\e(B)() <akr@jaist.ac.jp>"
+"From: ()(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)() <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)()()()()()()()()()()()()()()()()()()() <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)()()()()()()()()()()()()()()()()()()()\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)()()()()()()()()()()()()()()()()()()()()()() <akr@jaist.ac.jp>"
+"From:\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)()()()()()()()()()()()()()()()()()()()()()()\r
+ <akr@jaist.ac.jp>")
+
+(encode
+"From: (\e$B$"\e(B)()()()()()()()()()()()()()()()()()()()()()()() <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)()()()()()()()()()()()()()()()()()()()()()()()\r
+ <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: (\e$B$"\e(B)()()()()()()()()()()()()()()()()()()()()()()()()()()() <akr@jaist.ac.jp>"
+"From: (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)()()()()()()()()()()()()()()()(=?ISO-2022-JP?B?GyhC?=\r
+ =?ISO-2022-JP?B?GyhC?=)()()()()()()()()()()() <akr@jaist.ac.jp>"
+'zero-characters-encoded-word-hack)
+
+(encode
+"To: l@d (\e$B$"\e(B aaa)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEI=?= aaa)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+(encode
+"To: l@d (\e$B$"\e(B aaaa)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ aaaa)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+(encode
+"To: l@d (\e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+(encode
+"To: l@d (\e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEIgYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWE=?=\r
+ =?US-ASCII?Q?aaaaaaaaaaaaaaaaaa?=)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)"
+'encode-long-ascii-string-for-fold)
+
+(encode
+"To: l@d (\e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa()\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEIgYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWE=?=\r
+ =?US-ASCII?Q?aaaaaaaaaaaaaaaaaa?=()=?ISO-2022-JP?B?GyRCJCIbKEI=?=)"
+'encode-long-ascii-string-for-fold)
+
+(encode
+"To: l@d (\e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \e$B$"\e(B)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEI=?= aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+(encode
+"To: l@d (\e$B$"\e(B aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \e$B$"\e(B)(\e$B$"\e(B)"
+"To: l@d (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\r
+ =?ISO-2022-JP?B?GyRCJCIbKEI=?=)(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)")
+
+;----------------------------------------------------------------------------
+
+;;; Section 6: Encoding melancholic inputs.
+
+(encode
+"From: akr@jaist.ac.jp (\e$B$"\e(B(\e$B$$\e(B)\e$B$&\e(B)"
+"From: akr@jaist.ac.jp\r
+ (=?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCQbKEI=?=)=?ISO-2022-JP?B?GyRCJCYbKEI=?=)"
+'ignore-76bytes-limit)
+
+(encode
+"From: akr@jaist.ac.jp (\e$B$"\e(B(\e$B$$\e(B)\e$B$&\e(B)"
+"From: akr@jaist.ac.jp (=?ISO-2022-JP?B?GyRCJCIbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=(=?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=)=?ISO-2022-JP?B?GyRCJCYbKEI=?=)"
+'zero-characters-encoded-word-hack)
+
+(encode
+"From: \e$B$"\e(B(\e$B$"\e(B) <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEIoGyRCJCIbKEIp?= <akr@jaist.ac.jp>"
+'encode-sticked-comment-as-atom)
+
+(encode
+"From: \e$B$"\e(B(\e$B$"\e(B) <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?=(=?ISO-2022-JP?B?GyRCJCIbKEI=?=)\r
+ <akr@jaist.ac.jp>"
+'permit-sticked-comment)
+
+(encode
+"From: \e$B$"\e(B(\e$B$"\e(B) <akr@jaist.ac.jp>"
+"From: =?ISO-2022-JP?B?GyRCJCIbKEI=?= (=?ISO-2022-JP?B?GyRCJCIbKEI=?=)\r
+ <akr@jaist.ac.jp>"
+'separate-sticked-comment)
+
+(encode
+"To: \e$B$"\e(B<akr@jaist.ac.jp>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B<akr@jaist.ac.jp>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+'separate-sticked-special)
+
+(encode
+"To: <akr@jaist.ac.jp>,\e$B$"\e(B<akr@jaist.ac.jp>"
+"To: <akr@jaist.ac.jp>,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(encode
+"To: <akr@jaist.ac.jp>,\e$B$"\e(B<akr@jaist.ac.jp>"
+"To: <akr@jaist.ac.jp>, =?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+'separate-sticked-special)
+
+(encode
+"To: akr@jaist.ac.jp,\e$B$"\e(B<akr@jaist.ac.jp>"
+"To: akr@jaist.ac.jp,=?ISO-2022-JP?B?GyRCJCIbKEI=?=<akr@jaist.ac.jp>"
+'permit-sticked-special)
+
+(encode
+"To: akr@jaist.ac.jp,\e$B$"\e(B<akr@jaist.ac.jp>"
+"To: akr@jaist.ac.jp, =?ISO-2022-JP?B?GyRCJCIbKEI=?= <akr@jaist.ac.jp>"
+'separate-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:akr@jaist.ac.jp;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:akr@jaist.ac.jp;"
+'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:akr@jaist.ac.jp;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?= :akr@jaist.ac.jp;"
+'separate-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<akr@jaist.ac.jp>;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<akr@jaist.ac.jp>;"
+'ignore-76bytes-limit 'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<akr@jaist.ac.jp>;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=<akr@jaist.ac.jp>;"
+'zero-characters-encoded-word-hack 'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<akr@jaist.ac.jp>;"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?= : =?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ <akr@jaist.ac.jp>;"
+'separate-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<foo@bar>,\e$B$&\e(B<foo@bar>;,\e$B$(\e(B<foo@bar>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=<foo@bar>,=?ISO-2022-JP?B?GyRCJCYbKEI=?=<foo@bar>;,=?ISO-2022-JP?B?GyRCJCgbKEI=?=<foo@bar>"
+'ignore-76bytes-limit 'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<foo@bar>,\e$B$&\e(B<foo@bar>;,\e$B$(\e(B<foo@bar>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?=:=?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=<foo@bar>,=?ISO-2022-JP?B?GyRCJCYbKEI=?=\r
+ =?ISO-2022-JP?B?GyhC?=<foo@bar>;,=?ISO-2022-JP?B?GyRCJCgbKEI=?=<foo@bar>"
+'zero-characters-encoded-word-hack 'permit-sticked-special)
+
+(encode
+"To: \e$B$"\e(B:\e$B$$\e(B<foo@bar>,\e$B$&\e(B<foo@bar>;,\e$B$(\e(B<foo@bar>"
+"To: =?ISO-2022-JP?B?GyRCJCIbKEI=?= : =?ISO-2022-JP?B?GyRCJCQbKEI=?=\r
+ <foo@bar>, =?ISO-2022-JP?B?GyRCJCYbKEI=?= <foo@bar>;,\r
+ =?ISO-2022-JP?B?GyRCJCgbKEI=?= <foo@bar>"
+'separate-sticked-special)
+
+;;; Section 7: Using quoted-encoded-words.
+;;
+;; quoted-encoded-word \e$BI=8=\e(B
+;;
+;; RFC2047 \e$B$N%G%3!<%@$O@x:_E*$K\e(B(\e$B%G%3!<%I7k2L$G$J$/\e(B) encoded-word \e$B$=$N$b$N$r\e(B
+;; \e$B=PNO$7$J$1$l$P$J$i$J$$$3$H$,$"$k!#\e(B
+;;
+;; 1. \e$BCN$i$J$$\e(B charset \e$B$b$7$/$O\e(B encoding \e$B$,;XDj$5$l$F$$$?$H$-!#\e(B
+;; =?unknown-charset?known-encoding?some-encoded-text?=
+;; =?known-charset?unknown-encoding?some-encoded-text?=
+;; =?unknown-charset?unknown-encoding?some-encoded-text?=
+;;
+;; 2. \e$B%G%3!<%I$G$-$F$bFbMF$,7uF]$9$.$k$H$-!#\e(B
+;; Non ASCII \e$B3HD%\e(B RFC822 \e$B$NCf$K\e(B =?US-ASCII?Q?=0D=0A=0D=0A?= \e$B$N%G%3!<%I\e(B
+;; \e$B7k2L$rKd$a9~$`$N$O4m81$9$.$k!#\e(B
+;;
+;; \e$B$^$?!"%G%3!<%@$O\e(B encoded-word \e$B$N$h$&$K$_$($k%G%3!<%I7k2L$r=PNO$7$J$1\e(B
+;; \e$B$l$P$J$i$J$$$3$H$b$"$k!#\e(B
+;;
+;; =?US-ASCII?Q?=3D=3FUS-ASCII=3FQ=3Ftext=3F=3D?=
+;;
+;; \e$B%G%3!<%@$,C1$J$kJ8;zNs$r=PNO$9$k>l9g!"C1=c$K$d$k$H\e(B encoded-word \e$B$=$N$b$N$H\e(B
+;; encoded-word \e$B$N$h$&$K$_$($kJ8;zNs$r6hJL$G$-$J$$!#\e(B
+;; \e$B$3$3$G$OJ8;zNsCf$G$=$l$i$r3N<B$K6hJL$7$FI=8=$9$kJ}K!$r<($9!#\e(B
+;;
+;; rule 1: \e$BJ8;zNsCf$G\e(B =?charset?encoding?text?= \e$B$H$$$&%Q%?!<%s$K\e(B
+;; \e$B%^%C%A$7$J$$ItJ,$O$=$NItJ,$N$^$^$NFbMF$rI=$9!#\e(B
+;;
+;; rule 2: \e$BJ8;zNsCf$G\e(B =?charset?encoding?text?= \e$B$H$$$&%Q%?!<%s$K\e(B
+;; \e$B%^%C%A$9$kItJ,$O\e(B charset \e$B$N@hF,$K\e(B + \e$B$,$$$/$DIU$$$F$$$k$+$GFbMF$N\e(B
+;; \e$B2r<a$rJQ$($k!#\e(B
+;;
+;; \e$B6v?t$N>l9g\e(B(0, 2, 4, ...): charset \e$B$N@hF,$N\e(B + \e$B$N?t$rH>J,$K$7$?J8;zNs\e(B
+;; \e$B4q?t$N>l9g\e(B(1, 3, 5, ...): charset \e$B$N@hF,$N\e(B + \e$B$N?t$rH>J,\e(B(\e$B>.?tE@0J2<\e(B
+;; \e$B@Z<N$F\e(B)\e$B$K$7$F!"$=$l$r\e(B encoded-word \e$B$H;W$C$F%G%3!<%I$7$?J8;zNs!#\e(B
+;;
+;; NOTE: + \e$B$r\e(B quoted-encoded-word \e$BI=8=$N\e(B quote \e$BJ8;z$H8F$V!#\e(B
+;;
+;; NOTE: \e$B8=;~E@\e(B(1998/07/19)\e$B$G\e(B IANA \e$B$K$O\e(B + \e$B$r4^$`\e(B charset \e$B$O\e(B
+;; \e$BEPO?$5$l$F$$$J$$$N$G!"$=$l$i$N\e(B charset \e$B$r;H$C$?\e(B
+;; encoded-word \e$B$rI=8=$9$k$K$O\e(B + \e$B$r\e(B 1\e$B$D$D$1$k$3$H$K$J$k!#\e(B
+;;
+;; =?US-ASCII?Q?abcdef?= \e$B$H$$$&\e(Bencoded-word : =?+US-ASCII?Q?abcdef?=
+;;
+;; =?US-ASCII?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?US-ASCII?Q?abcdef?=
+;; =?+US-ASCII?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?++US-ASCII?Q?abcdef?=
+;; =?++US-ASCII?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?++++US-ASCII?Q?abcdef?=
+;; =?+++US-ASCII?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?++++++US-ASCII?Q?abcdef?=
+;; =?US-ASCII+?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?US-ASCII+?Q?abcdef?=
+;; =?U+S-ASCII?Q?abcdef?= \e$B$H$$$&J8;zNs\e(B : =?U+S-ASCII?Q?abcdef?=
+;;
+;; NOTE: encoded-word \e$B$K8+$($kJ8;zNs$G\e(B + \e$B$,G\A}$5$l$k$N$O\e(B charset \e$B$N\e(B
+;; \e$B@hF,$@$1$G$"$j!"\e(Bencoding \e$B$d\e(B encoded-text \e$B$O$?$H$(\e(B + \e$B$,F~$C$F$$$F$b\e(B
+;; \e$BJQ2=$7$J$$!#$^$?!"\e(Bcharset \e$BCf$G$b\e(B \e$B@hF,0J30$N\e(B + \e$B$OJQ2=$7$J$$!#\e(B
+;;
+;; rule 3: \e$BJ8;zNsA4BN$NFbMF$O!"\e(Brule 1 \e$B$H\e(B rule 2 \e$B$G2r<a$7$?3FItJ,$N\e(B
+;; \e$BJ8;zNs$rC1=c$KO"7k$7$?J8;zNs$H$9$k!#\e(B
+;;
+;; NOTE: RFC2047 \e$B$G$O\e(B encoded-word \e$B$,6uGr$G6h@Z$i$l$J$1$l$P$J$i$J$$$H$+!"\e(B
+;; encoded-word \e$B$O\e(B 75bytes \e$B0J2<$G$J$1$l$P$J$i$J$$$H$+!"\e(B
+;; encoded-word \e$B$,4^$^$l$k9T$O\e(B 76bytes \e$B0J2<$G$J$1$l$P$J$i$J$$$J$I$H$$$&\e(B
+;; \e$B5,Ls$,$"$k$,!"\e(Bquoted-encoded-word \e$BI=8=$G$O$=$l$i$O:NMQ$7$J$$!#\e(B
+;; \e$BC1=c$K\e(B encoded-word \e$BFbIt$NJ8K!$@$1$rMxMQ$9$k!#\e(B
+;; (\e$BK\<AE*$K$O0[$J$kJ8K!$r:NMQ$9$k$3$H$b2DG=$G$"$k$,!"\e(BRFC2047 \e$B$K7I0U$r\e(B
+;; \e$BI=$7$F\e(B encoded-word \e$B$NJ8K!$r:NMQ$9$k!#\e(B)
+;;
+;; NOTE: quoted-encoded-word \e$BI=8=$7$?J8;zNs$NO"7k$O0BA4$G$O$J$$!#\e(B
+;; =?+US-ASCII?Q?ab \e$B$H\e(B cd?= \e$B$H$$$&\e(B quoted-encoded-word \e$BI=8=$7$?J8;zNs$O\e(B
+;; \e$B$=$l$>$l$=$NJ8;zNs$=$N$b$N$rI=8=$9$k$,!"$=$l$i$rO"7k$7$?J8;zNs\e(B
+;; =?+US-ASCII?Q?abcd?= \e$B$O\e(B abcd \e$B$H$$$&J8;zNs$rI=8=$9$k$3$H$K$J$j!"\e(B
+;; \e$B$=$l$>$l$NFbMF$NO"7k$H$O$J$i$J$$!#\e(B
+;;
+;; \e$B$3$l$O$H$/$K\e(B Non ASCII \e$B3HD%\e(B RFC822 \e$B$NCf$K\e(B quoted-encoded-word \e$BI=8=$r\e(B
+;; \e$BKd$a9~$`$H$-$K5$$rIU$1$J$1$l$P$J$i$J$$!#\e(B(\e$BKd$a9~$s$@7k2L$O@5$7$$\e(B
+;; quoted-encoded-word \e$BI=8=$H$O$J$i$J$$$+$bCN$l$J$$!#\e(B)