Other new symbol sets include dominoes, Mahjong, dictionary punctuation marks, and math additions.
其他新的符号集，包括多米诺骨牌，麻将，字典标点符号，和数学补充。
2
Not every string is valid Rexx symbol — which restricts the keys in the dictionary — but Rexx is pretty liberal about its symbol names, compared to most languages. E.g.