Multi-select problem: How does the next paragraph end?

How to make and use a rootball lifting flowerpot
Assemble the supplies needed.
For one system, you'll need two identical small plastic flowerpots, a thin plastic plate (for example, the lid of a margarine box) and scissors. The pots on the photo are about 5 cm (2 inches) high and 5.5 cm (2.2 inches) wide.

Select from: I. The sets (groups of pots on the same plate) are usually 9 cm (2.0 in) wide, then 6 cm (4 inches) wide. See step 3 for a detailed painting guide.. II. Open the larger plastic potpourri pot. Open it so that it's upright and 4 cm (1/2 inch) wide.. III. The way you wrap the plates is up to you. You can mix and match the plates to create one, learn how, and you're done.. IV. Make one " insert " by cutting away about two thirds of the side of one plastic flowerpot. Then you have one flowerpot and one insert..
IV.