public boolean canResolve(CanalComm target, Clause cl) {
   PField pf = inputLanguages.get(target);
   boolean out = false;
   try {
     out = IndepPField.partlyBelongsTo(getEnv(), pf, cl);
   } catch (ParseException e) {
     // Never happens
     e.printStackTrace();
   }
   return out;
 }