+ ;; This is the most generic pattern. It follows Cases A, B, C and
+ ;; E in Step 1. Now Mark #1 is used to indicate the critical part
+ ;; that requires pre-base substitution in the following steps.
+
+ ;; 1 2 3 4 5 6 7 8 9 10
+ (" (RH)?([^ xy]+)x([^ y]*)y(YH)?(m)?(b)?(p)?(A)?(a)?(HN|HJ|H)? "