In a game yesterday I was in this situation:

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with a triple crak-wait that puts me in furiten, or a penchan. If I discard either

or

I could draw/call

(10 total tiles) and wait on

, but if I draw/call bam then I'm furiten (on 10 tiles, but furiten nonetheless).
On the other hand, I could discard one of

and wait on

(and

to have a better wait) without being furiten.