private static boolean textOfExpressionsIsEquivalent(GrExpression expToCompare1,
                                                       GrExpression expToCompare2) {
    final String text1 = expToCompare1.getText();
    final String text2 = expToCompare2.getText();
    return text1.equals(text2);
  }
private static boolean textOfExpressionsIsEquivalent(GrExpression expToCompare1,
                                                       GrExpression expToCompare2)