!752

static Map<S, S> shortDefinitions;

p {
  shortDefinitions = new PersistentMap("shortDefinitions");
}

synchronized answer {
  if (!tb()) null;
  
  if "a * is a *" {
    shortDefinitions.put(toLowerCase(m.unq(0)), m.unq(1));
    ret "OK!";
  }
  
  if "a * is not a *" {
    S in = toLowerCase(m.unq(0));
    if (eqic(shortDefinitions.get(in), m.unq(1))) {
      shortDefinitions.remove(in);
      ret "Removed!";
    }
  }

  if "what is a *" {
    S in = toLowerCase(m.unq(0));
    S out = shortDefinitions.get(in);
    if (nempty(out))
      ret format("A * is a *", in, out);
  }
}