@LPH : I meant that this is the most complete / thorough set of rules I found. I guess this formulation is more appropriate, I'll update my answer.

Well, I think it's used enough to have an idea of the pronunciation... But you can suggest another word if you want.

Perfect. I updated the post.

Fine, even though I can't hear the difference. I will correct it, but please suggest another word, more ordinary than lin. We are trying to help someone who is not fluent in french, and this word is not common enough.

In this case, you pronounce in from tin exactly like you pronounce the number 1. In general, I agree that it may differ, but here it's absolutely the same sound.

What I was saying is that even though the position of the adjective is usually set (prochain is an adjective, not an adverb), there is no strict rule regarding "prochain". I used here the examples of this thread (as I said in my answer), which are the bests I have found so far : forum.wordreference.com/showthread.php?t=170145

I agree, they're the same [o]. And I was really talking about the "co" part of co-op.