m4_divert(-1)`'m4_dnl
 m4_define(choicez,`$1() m4_divert(2)`'m4_dnl
function _$1(  str) {
	str="$1";
	if (str in Cache) return Cache[str];
	return Cache[str]=$1()
} 
m4_divert' )
m4_define(choicez1,`$1($2) m4_divert(2)`'m4_dnl
function _$1($2,  str) {
	str="$1/" $2
	if (str in Cache) return Cache[str];
	return Cache[str]=$1($2)
} 
m4_divert(0) ' )
m4_define(choicez2,`$1($2,$3) m4_divert(2)`'m4_dnl
function _$1($2,$3,    str) {
	str="$1/" $2 "/" $3;
	if (str in Cache) return Cache[str];
	return Cache[str]=$1($2,$3)
} 
m4_divert' )
m4_divert`'m4_dnl