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static void lispStandardExecutors() {
  // (X)
  lispEvaluator("mcoswmplpqlieruo", new F1<Lisp, Bool>() {
    Bool get(Lisp l) {
      ret isTrue(callLispEvaluator(l.get(0)));
    }
  });
  
  // Assert (X).
  lispExecutor("rzryqdohxtczvzgn", voidfunc(Lisp l) {
    l = l.get(0);
    if (!isTrue(callLispEvaluator(l)))
      fail("Not true: " + l);
  });
  
  // Make an empty thought space X.
  lispExecutor("jamvyfwypzbptvle", voidfunc(Lisp l) {
    S name = l.raw(0);
    addThoughtSpace(new ThoughtSpace(name));
  });
  
  // X is empty (thought space)
  lispEvaluator("yvmxaacduvvomgqi", new F1<Lisp, Bool>() {
    Bool get(Lisp l) {
      ret isEmpty(getThoughtSpace(l.raw(0)).statements);
    }
  });
  
  // X contains Y (thought space)
  lispEvaluator("unfiqixlxwqnomcs", new F1<Lisp, Bool>() {
    Bool get(Lisp l) {
      ret getThoughtSpace(l.raw(0)).containsStatement(l.get(1));
    }
  });
  
  // Add (X) to Y. (thought space)
  lispExecutor("matnhiruhwprdiir", voidfunc(Lisp l) {
    getThoughtSpace(l.raw(1)).addStatement(l.get(0));
  });
  
  // Apply always rules in X. (thought space)
  lispExecutor("bcypplfticghlkxy", voidfunc(Lisp l) {
    thoughtSpace(getThoughtSpace(l.raw(0));
    try {
      applyAlwaysRules(100);
      //print("After always rules: " + struct(keys(thoughtSpace().statementsIndex)));
    } finally {
      thoughtSpace(null);
    }
  });
  
  // No X where Y
  lispEvaluator(ll("bblhpfgfvcyjfwmd", "kxlzhendchftgjqh"), new F1<Lisp, Bool>() {
    Bool get(Lisp l) {
      S var = l.raw(0), newVar = aGlobalID();
      Lisp term = l.get(1);
      Lisp newTerm = lispReplaceVars(term, litmap(var, lisp(newVar)));
      //print("Evaluating negation: " + newVar + " - " + newTerm);
      new Map<S, Lisp> m;
      m.put(newVar, null);
      m = matchCondition_first(newTerm, m);
      //print("  Result: " + struct(m));
      ret m == null;
    }
  });
}