I am confused by the success condition on card 121.

It says something to the effect of: Encounter [wateland] until you find the super mutants.

I looked through the wasteland encounter deck and there is no card titled "the super mutants" or any cards that spawn super mutants. I'm not sure how to 'find' the super mutants Does anyone know how you succeed in this quest?

Thanks

EDIT: Disregard. I’m an idiot, I didn’t see the difference between ‘stage’ and ‘add’ in the rule book.