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(
    [ # data matching first condition
...
        [ $first, $second, $third ], [ $first, $second, $third ], ...,
    ],
)

#!/usr/bin/env perl -l

...
1,2,3
1,2,2
1,1,1

*** Simple Formatting Rules ***
1 (1st) equals 1 (2nd) and 1 (2nd) equals 1 (3rd)
...
2 (3rd) equals both 2 (1st) and 2 (2nd)
2 (3rd) only equals 2 (2nd)
1 (3rd) only equals 1 (2nd)