SO               1733 ext/nkf/nkf-utf8/nkf.c     if (c2 == SO) c2 = JIS_X_0201_1976_K;
SO               5514 ext/nkf/nkf-utf8/nkf.c 	    } else if (c1 == SO && (!is_8bit || mime_decode_mode)) {