question about gm re-play / re-run

[wyld windsworn]

so, i understand that i can use my gm stars to replay a scenario, which i did once.

what are the actual rules for this? --

am i allowed only to replay / re-run once per star, per scenario?
or once done, does it "expends" a star? if not, am i allowed to do re-run / re-play, but with a different scenario?
or is it as simple as if i had 2 stars, i am allowed to re-run / re-play exactly 2 times?
or something else?

too lazy to do research :-P

thx

[wyld windsworn]

found my answer.