The ACLS-6 classifies a sequence of steps into an activity by doing three whip stitches. To do the whip stitch, they can group a set of three numbers into a complete set.
For the other activities, they are grouping a series of steps (actions) to do an activity.
Within the copying activity, the person can make a series of stripes to cover the surface. The stripes may be made without referring to the sample.
When completing a placement activity (e.g. flower pot), they have the concept of making a picture but the ability to follow the sample is vague and limited.