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.
The repetition range can contain ranges and numbers, these elements must be separated by commas. For example, 3, 5-7. In the above example, the repetition range is 3,5-7. The repetition count for the included structure can be 3,5,6, or 7.
To draw a repeating unit with repetition ranges, follow the steps below.