"Subject: \"a\"=?ISO-2022-JP?B?GyRCJCIbKEI=?=\"b\"")
(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 \"")
+
+(decode
"Subject: (Re: =?ISO-2022-JP?B?GyRCJCIbKEI=?=)"
"Subject: (Re: =?ISO-2022-JP?B?GyRCJCIbKEI=?=)")