I'm also wondering about #10
1) Similar kind of thing applies that I asked about in post above- says that L and N speak the same language, can we or why can't we put N in Z so that both N and L speak Spanish?
2) Let's say we put N in X. Would that mean the minimum number of tourists who could speak Turkish would be 1, (because everybody who's in Y could speak French, so just N. But the Maximum number who could speak Turkish would be three, because then everybody who is with Y could speak Turkish. Or would the max be 4, because it could be N (in X), H, I, and K/M in Y?