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#!/usr/bin/env perl
use warnings;
...
2    312    2_a    22    2_b    12
2    310    1_a    31    1_b    20
2    310    2_a    21    2_b    12

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1 - 300 1_a 30 1_b 20
    300 2_a 22 2_b 12
...
    312 2_a 22 2_b 12
    310 1_a 31 1_b 20
    310 2_a 21 2_b 12