public Collection<String> getSuggestedNames(@NotNull final PyExpression expression) {
    Collection<String> candidates = generateSuggestedNames(expression);

    Collection<String> res = new ArrayList<>();
    for (String name : candidates) {
      if (myValidator.checkPossibleName(name, expression)) {
        res.add(name);
      }
    }

    if (res.isEmpty()) {  // no available names found, generate disambiguated suggestions
      for (String name : candidates) {
        int index = 1;
        while (!myValidator.checkPossibleName(name + index, expression)) {
          index++;
        }
        res.add(name + index);
      }
    }

    return res;
  }
public Collection<String> getSuggestedNames(@NotNull final PyExpression expression)