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##### LM ##### context undo lex ignore /[ ]+/ literal `; token NL /'\n'/ token id /[a-zA-Z_]+/ end def item [id] def start [item* `; NL] end cons Undo: undo[] parse Input: undo::start( Undo )[ stdin ] print( Input ) ##### IN ##### a b; ##### EXP ##### a b;