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my $SPACE  = q{ };
my $PRINTF = '%3s %3s %s %s %s %s';
...
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
        2_a 22 2_b 12
...
        2_a 22 2_b 12
    310 1_a 31 1_b 20
        2_a 21 2_b 12