@end lisp
\e$B$H$$$&0lAH$G$9!#\e(B
-\e$BBh0l$NMWAG\e(B @samp{\e$B>r7o\e(B} \e$B$O\e(B sexp \e$B$G$9!#>\$7$/$O$9$08e$G@bL@$7$^$9!#\e(B
+\e$BBh0l$NMWAG\e(B @samp{\e$B>r7o\e(B} \e$B$O\e(B S \e$B<0$G$9!#=q<0$K$D$$$F$O$9$08e$G@bL@$7$^$9!#\e(B
\e$BBhFs$NMWAG\e(B @samp{\e$B%U%)%k%@\e(B} \e$B$O%a%C%;!<%8$N?6$jJ,$1@h$N%U%)%k%@L>$G$9!#\e(B
\e$B$b$7Bh;0$NMWAG\e(B @code{continue} \e$B$,%7%s%\%k$H$7$FM?$($i$l$k$H!"\e(B
\e$B$=$N>r7o$,K~$?$5$l$?$H$7$F$b?6$jJ,$15,B'$NI>2A$rB3$1$^$9!#\e(B
(@samp{CONDITION} @samp{FOLDER} [@code{continue}])
@end lisp
-The 1st element @samp{CONDITION} is a sexp. Its grammar will be
-explained below. The 2nd element @samp{FOLDER} is the name of the folder
-to split messages into. When the 3rd element @code{continue} is
-specified as symbol, evaluating rules is not stopped even when the
-condition is satisfied.
+The 1st element @samp{CONDITION} is a balanced expression (sexp). Its
+grammar will be explained below. The 2nd element @samp{FOLDER} is the
+name of the folder to split messages into. When the 3rd element
+@code{continue} is specified as symbol, evaluating rules is not stopped
+even when the condition is satisfied.
The grammar for @samp{CONDITION} is as follows. See example above to
learn how to write the condition practically.