Support hiding auxiliary predicates

examples/exact-cover.spec

@@ -1,6 +1,4 @@
-# Auxiliary predicate to determine whether a variable is integer. is_int/1 is declared as an input
-# predicate so that anthem doesn’t generate its completed definition
-input: is_int/1.
+# Auxiliary predicate to determine whether a variable is integer
 axiom: forall X (is_int(X) <-> exists N X = N).
 
 # Perform the proofs under the assumption that n is a nonnegative integer input constant. n stands
@@ -11,6 +9,10 @@ assume: n >= 0.
 # s/2 is the input predicate defining the sets for which the program searches for exact covers
 input: s/2.
 
+# Only the in/1 predicate is an actual output, s/2 is an input and covered/1 and is_int/1 are
+# auxiliary
+output: in/1.
+
 # Perform the proofs under the assumption that the second parameter of s/2 (the number of the set)
 # is always an integer
 assume: forall X, Y (s(X, Y) -> is_int(Y)).

examples/example-0.spec

@@ -1 +1,3 @@
+input: p/2.
+
 assert: exists X, Y p(X, Y) <-> exists X q(X).

examples/example-1.spec

@@ -1,3 +1,5 @@
+input: p/1.
+
 assert:
 	forall N
 	(