public TermFunction ReplaceVariablesAndConstants(Term function)
{
var assignment = new Substitution();
var termsToReplace = new HashSet<Term>();
GdlVisitors.VisitTerm(function, new GdlVisitor
{
VisitConstant = constant => termsToReplace.Add(constant),
VisitVariable = variable => termsToReplace.Add(variable)
});
foreach (TermVariable var in GetVariables(function))
assignment.AddMapping(var, GetUnusedVariable());
return (TermFunction)function.ApplySubstitution(assignment);
}