-<h3> Base64
-<node> Base64
-<p>
-<dref>RFC 2045</dref> \e$B$GDj5A$5$l$F$$$k\e(B <dref>MIME</dref> \e$B$K$*$1$k\e(B <a
-node="binary">binary data</a> \e$B$N\e(B network \e$B$G$NJQ49K!$N#1$D!#\e(B
-<p>
-\e$B!X\e(B64 \e$B?J?t!Y$H$$$&0UL#$G!"\e(B3 byte \e$B$N\e(B data \e$B$r\e(B 0 \e$B$+$i\e(B 63 \e$B$N?t$rI=$9\e(B
-<dref>ASCII</dref> 4 \e$BJ8;z$KJQ49$9$kJ}K!!#!J$b$7!"\e(B4 \e$BJ8;z$K$J$i$J$1$l$P\e(B
-<concept>pad</concept> \e$B$H8F$P$l$k5M$aJ*$r$7$FD9$5$rD4@0$9$k!K\e(B
-<p>
-\e$B$3$N\e(B 65 \e$B<oN`$NJ8;z$O\e(B ASCII \e$B$H\e(B EBCDIC \e$B$N6&DLItJ,$+$iA*$P$l$F$*$j!"\e(B
-Internet \e$B0J30$N\e(B network \e$B$r7PM3$9$k>l9g$G$b0BA4$KE>Aw$G$-$k$h$&$K@_7W$5\e(B
-\e$B$l$F$$$k!#\e(B
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-