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$start $stop $id1 $id2
1    100    1    2
...
601    700    0    0
701    800    1    1
801    900    1    2

1    100    1    2
101    200    1    2
...
601    700    1    0
701    800    1    1
801    900    1    2

while(<>){
chomp;
...

}