Custom drag and drop - need to only allow 1 drop item in target at a time

I had to create a custom drag and drop slide all on my own to create individual feedback for each choice. I have 5 possible drag items all going onto 1 target. Is there a way I can only allow 1 drag item at a time onto that target (like you can in the actual freeform quiz interaction)? How can I do this on a custom slide? I want every possible outcome to be tried by the user with custom feedback for each with no submit button.

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