@best_of_mltshp What if you swap out the coffeeshop for a teashop?
@MiniMia @moonrabbit @helenclayton

@best_of_mltshp Masterful!

@best_of_mltshp consider the idea of domain range and inverse functions , I mean switch the elements of the domain with those of the range , its not the same f , no , no until f = f^{-1}