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    pattern 1:  1=2 2=3 0=-1
    pattern 2:  1=2 3=4
    pattern 3:  3=4 5=2

    # PART 1:  Per-column pattern-matching values

...
    'pattern 1' => 3,
    'pattern 2' => 2,
    'pattern 3' => 2

    my %pattern_colvals;
    my %pattern_sizes;
...
            push @{$pattern_colvals{$col}{$match_val}}, $pattern;
        }
    }

    # parse input CSV file and check for matches against patterns

...
            }
        }
    }

    $ { echo -1,2,3,4,5,6
        echo -1,2,4,0,0,9
...
    line 1 matches pattern 1
    line 1 matches pattern 2
    line 3 matches pattern 3