Ask.
How the selected elements are organized? Is there a particular organization pattern to the design process? Is the organization past-dependent or does the process delete and retransform all elements with each iteration?

Know.
The organization of the selected items can be completely free, at random or according to a predetermined organizational pattern. Micro-aleatoric techniques use chance operations at the level of composition, which means the course of action is relatively open. In a macro-aleatoric organization the elements get arranged by a predefined rule set, thereby creating a process with placeholders which are replaced by selected elements.

How.
Make a sketch of a possible process state, draw motion vectors and mark the origins of elements. Describe the organization pattern as an abstract rule set.