As a general thing declare variables where they are first needed so their scope is clear. In your code you declare a bunch of variables outside the outer for loop, almost none of which are used except in the innermost for loop.
Your problem however is with the one variable that does need to be global to the outer for loop. Even though declared there, you reset it immediately before you test it! The immediate fix is to simply remove %seen = ();.
True laziness is hard work
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