pre_convert      1088 ext/nkf/nkf1.7/nkf.c     c2 = pre_convert(c1,c2); c1 = c1_return;
pre_convert      1140 ext/nkf/nkf1.7/nkf.c     c2 = pre_convert(c1,c2); c1 = c1_return;
pre_convert      1190 ext/nkf/nkf1.7/nkf.c     c2 = pre_convert(c1,c2); c1 = c1_return;