LitOpt	regex/litopt.html#LitOpt	litopt: LitOpt	
canOpt	regex/litopt.html#canOpt,LitOpt	litopt: canOpt(litOpt: LitOpt): bool	
litopt2	regex/litopt.html#litopt2,RpnExp	litopt: litopt2(exp: RpnExp): LitOpt