Multiple triggerboxes in multiple groups for activate an event

Hello!
I have a system made by three groups of three triggerboxes in each (9 total). There is only one correct answer in each of the three groups and I need that only when the correct answer for each group has been trigged ( I’m using character begin and end overlap for design proposes) an event happens.
The only other rule is that, for each group, the last triggerbox you enter is the one that is activated.

I manage to make the subsystem working for an individual group like so:

But couldnt figure it out how to link the three groups together without having side effects!
What I need:

Thank you for any help!

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Group A looks like this

B and C are the same.

They all connect like this:

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just perfect! And also taught me how to use booleans
Thanks!!

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