It is used for populating the part numbers hash. The part number is the key and '1' is the associated value. The '1' doesn't matter. You just want to have a hash with part numbers as the unique keys of the hash since you can quickly and easily check to see if a key exists in a hash. For example: 
print "$key exists in hash" if exists $hash{$key};

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In reply to Re^5: extract line by frozenwithjoy
in thread extract line by lallison

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