Thanks for your further help on this. I feel like I'm almost there, but not quite.. I made the changes you suggested, but I'm still getting errors starting at the line
next unless scalar @{ $data{$id}[$window] } >= 2;
The error is:
Can't use an undefined value as an ARRAY reference
Is this referring to $window? Regarding the way I was using it above, was $window the outer array that holds all the smaller arrays? Even if this is true, I don't see why I'm getting the error messages I'm getting.
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