Single clause queries

src/prolog/components/terms/Head.kt

@@ -1,7 +1,5 @@
 package prolog.components.terms
 
-import prolog.components.Functor
-
 /**
  * Part of a [Clause][prolog.components.expressions.Clause] before the [neck][prolog.terms.Neck] operator.
  *
@@ -11,3 +9,5 @@ import prolog.components.Functor
 abstract class Head: Term {
     abstract val functor: Functor
 }
+
+typealias Functor = String