+PLACEHOLDER2 NOTHING, no ; placeholder for missing NDIGITU
+NDIGITA NDIGIT, no 0 S ; Match [^0-9]
+
+POSIXD POSIXD, none 0 S ; currently unused except as a placeholder
+POSIXL POSIXD, none 0 S ; currently unused except as a placeholder
+POSIXU POSIXD, none 0 S ; currently unused except as a placeholder
+POSIXA POSIXD, none 0 S ; Some [[:class:]] under /a; the FLAGS field gives which one
+NPOSIXD POSIXD, none 0 S ; currently unused except as a placeholder
+NPOSIXL POSIXD, none 0 S ; currently unused except as a placeholder
+NPOSIXU POSIXD, none 0 S ; currently unused except as a placeholder
+NPOSIXA POSIXD, none 0 S ; complement of POSIXA, [[:^class:]]
+# End of order is important (within groups)
+