Strmap: module {	PATH: con "/dis/ebook/strmap.dis";	Map: adt {		i2s:	array of string;		s2i:	array of list of (string, int);			new:	fn(a: array of string): ref Map;		s:	fn(map: self ref Map, i: int): string;		i:	fn(map: self ref Map, s: string): int;	};};