This is probably a silly question but that probably makes it simple to answer.
It says that you can spend "An advantage" to recover 1 strain (can be selected multiple times)
Does that mean that the other options you can't do more than once?
Can I spend 3 advantages to give 3 [_] (boost dice) to the next active allied characters check?
I only ask because I don't see why it would say that bit about being able to recover 1 strain more than once unless there was a limit on the others.