Checkpoint

src/prolog/components/Provable.kt

@@ -1,5 +1,13 @@
 package prolog.components
 
+import prolog.Substitution
+
 interface Provable {
-    fun prove(): Boolean
+    /**
+     * Proves the current [Provable] instance.
+     *
+     * @return a sequence of [Substitution] instances representing the results of the proof.
+     * If the proof fails, an empty sequence is returned.
+     */
+    fun prove(): Sequence<Substitution>
 }