This version does the “coda”: materials split into multiple places so you can see parallel enabling (multiple prep tasks can fire in any order).
Hover for micro-explainers; click a transition to fire; drag places to tidy.
Token: current marking (what’s “true / available” right now).
Transition: task/event (enabled iff all input places have tokens).
The point: with split resources, the net finally exhibits non-trivial concurrency (multiple enabled transitions), so “schedule options = firing sequences” stops being a cheat.