A sequence of ranges to specify the repetition can also be used in a special group called repeating unit with repetition ranges. See the figure below for an example.
In this example, the repetition range is 3,5-7. The repetition count for the included structure can be 3,5,6, or 7. The repetition range can contain ranges and numbers, these elements must be separated by commas. For example, 3, 5-7.
To draw a repeating unit with repetition ranges, follow the steps below.