@NotNull
  private static String invertOperator(@NotNull PsiElement op) {
    if (op.getText().equals(">")) {
      return "<";
    }
    if (op.getText().equals("<")) {
      return ">";
    }
    if (op.getText().equals(">=")) {
      return "<=";
    }
    if (op.getText().equals("<=")) {
      return ">=";
    }
    return op.getText();
  }
@NotNull
  private static String invertOperator(@NotNull PsiElement op)