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$ cat pm_11139481_csv_kv_pairs_data.txt
http://example.com/?AB1=101&NN=201&XYZ=401
...
http://example.mil/?
https://example.mil/
http://example.edu/?PQR=504

#!/usr/bin/env perl

...

    return;
}

$ cat pm_11139481_csv_kv_pairs_data.csv
AB1,MM,NN,PQR,XYZ
...
,,,,
,,,,
,,,504,