Legend: Begins when play begins;
can begin whenever some condition holds;
follows when a previous scene ends;
begins simultaneously;
never begins;
never ends.
Begins when: the game is in progress
Ends when: the game is over
Begins when: the laptop is switched on
What happens:
(say "The butterfly is coming closer to you."; ...)
Every turn
(change the distance of butterfly to the distance of butterfly - 1; ...)
Ends when: the distance of butterfly is 0