anchor.diff:  Map objects = {};
   
   /**
  - * Ask questions and returns a list of symptoms.
  + * Asks questions and returns a list of symptoms.
    */
   List<int> askQuestions() {
     var acceptedSymptoms=[];
  
positive.code:     var index = (symptomsCopy.length > 1) ? random.nextInt(symptomsCopy.length-1) : 0;
      print('Does this object has "${symptomsCopy[index]}" symptom (y/n)?');
      if (stdin.readLineSync() == 'y') {
        acceptedSymptoms.add(index);
      }
      symptomsCopy.removeAt(index);
    }
  
negative.code:     while(chosenSymptoms.length < 2) {
        print('Enter one more symptom to describe this object:');
        symptoms.add(stdin.readLineSync());
        chosenSymptoms.add(symptoms.length-1);
      }
    } else {
      String objectName;
  