Ask.
How the individual elements are selected? What are the rules for the selection process? How can these rules be formulated syntactically?

Know.
By applying one or more selection filters, elements are chosen from the repertoire according to certain rules. This process can be done serially, through a filter system or by a sequence of rules, which again can be modified with an aleatoric procedure.

How.
Try to formulate an set of rules on how individual elements are selected and activated from the repertoire.