static O generalLispEval(Lisp l) {
  if (l == null) null;
  S evaluator = first(followForwardRelation_raw("mssmzemxxztdpphw", l.head));
  if (evaluator != null)
    ret conceptCall(evaluator, map(f generalLispEval, l));
    
  if (l.isLeaf())
    for (Lisp rule : lispTruth2("yrxfddfomyzlqwri"))
      if (isTrue(callConcept(rule.raw(0), l.head)))
        ret callConcept(rule.get(1), l.head);
        
  fail("Can't evaluate " + l);
}