code: func (nb NameBuilder) Between(lower, upper OperandBuilder) ConditionBuilder {
  	return Between(nb, lower, upper)
  }
docs: // Between returns a ConditionBuilder representing the result of the
  // BETWEEN function in DynamoDB Condition Expressions. The resulting
  // ConditionBuilder can be used as a part of other Condition Expressions or as
  // an argument to the WithCondition() method for the Builder struct.
  //
  // Example:
  //
  //     // condition represents the condition where the value of the item
  //     // attribute "Rating" is between values 5 and 10
  //     condition := expression.Name("Rating").Between(expression.Value(5), expression.Value(10))
  //
  //     // Used in another Condition Expression
  //     anotherCondition := expression.Not(condition)
  //     // Used to make an Builder
  //     builder := expression.NewBuilder().WithCondition(condition)
  //
  // Expression Equivalent:
  //
  //     expression.Name("Rating").Between(expression.Value(5), expression.Value(10))
  //     // Let :five and :ten be ExpressionAttributeValues representing the value
  //     // 5 and the value 10
  //     "Rating BETWEEN :five AND :ten"