fmod MULTFIRST is 
	sorts MyItem MyList InVec .
	 
	*** DT definitions (constructors)
	op [] : -> MyList [ctor] .
	op cons : MyItem MyList -> MyList [ctor] .
	 
	*** defined function names (to be induced, preds, bk)
	op multfirst : MyList -> MyList [metadata "induce"] .
	*** input encapsulation
	op in : MyList -> InVec [ctor] .
	 
	vars U V W X Y Z : MyItem .

	eq multfirst([]) = [] .
	eq multfirst(cons(Y,[])) = cons(Y,[]) .
	eq multfirst(cons(Y,cons(X,[]))) = cons(Y,cons(Y,[])) .
	eq multfirst(cons(Y,cons(X,cons(Z,[])))) = cons(Y,cons(Y,cons(Y,[]))) .
endfm