thank you for the details and the loop suggestion. The "//" means if for a and b overlap doesn't exist then it equals zero, right?

But where would I put this line? after the loop? no -> between the $a and $b? would I have to embed it in a loop with a and b being all elements of members?

In reply to Re^2: how to set a value for a hash reference by AWallBuilder
in thread how to set a value for a hash reference by AWallBuilder

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