Rpg Maker Developers Group

Hello! I'm a total newbie at this, but I've been able to figure most things out.

The thing I'm really stuck with is an event where the player must choose item A, B, or C and only one.

Example: The player picks item A. When they approach item B, I want it to say "You already have A. I cannot give you anything else." But I also want this dialogue to happen for A and C (if A is in the inventory). 

I've done this by having a conditional branch (player facing up) with three branches inside it (A in inventory - else, give item A, B in inventory - else, give item A, C in inventory - else, give item A).

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I've also tried it by having the branches swapped, but I don't think I can explain it.

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My problem is that if the player chooses item A, for example, the "You already have A. I cannot give you anything else." dialogue doesn't show up unless the top conditional branch is for already having item A. Otherwise, it lets you take multiples of A, B, and C.

Sorry, I know that was probably really confusing, but I tried to make it simpler by using A, B, and C. ;~;

I appreciate any advice you can give me!