fmod SWITCH 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 switch : MyList -> MyList [metadata "induce"] .
	*** input encapsulation
	op in : MyList -> InVec [ctor] .
	 
	vars U V W X Y Z : MyItem .

	eq switch([]) = [] .
	eq switch(cons(V,[])) = cons(V,[]) .
	eq switch(cons(X,cons(W,[]))) = cons(W,cons(X,[])) .
	eq switch(cons(V,cons(Z,cons(W,[])))) = cons(Z,cons(V,cons(W,[]))) .
	eq switch(cons(V,cons(Z,cons(W,cons(Y,[]))))) = cons(Z,cons(V,cons(Y,cons(W,[])))) .
	eq switch(cons(V,cons(Z,cons(W,cons(Y,cons(X,[])))))) = cons(Z,cons(V,cons(Y,cons(W,cons(X,[]))))) .

endfm