Sentence examples similar to which is unideal from inspiring English sources

Guess which is which.

"Which is?

The question is: which is which?

The problem is deciding which is which.

"Which is our auction, which is silent.

"Which, ah, which is not ideal".

So which is American and which European?

I don't care which is which.

Which is which goes without saying.

Your challenge: figure out which is which.

How do you recognize which is which?