@Override
    public PsiElement simplify(PsiMethodCallExpression call) {
      PsiExpression left = extractLeft(call);
      if (left == null) return null;
      PsiExpression right = extractRight(call);
      if (right == null) return null;
      CommentTracker ct = new CommentTracker();
      String replacement = ct.text(right) + ".containsAll(" + ct.text(left) + ")";
      return ct.replaceAndRestoreComments(call, replacement);
    }
@Override
    public PsiElement simplify(PsiMethodCallExpression call)