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1234 2321 0      45    1st 
2122 sdsa  0   0  34        
...
1232 ffff     0   0         1st 
3213 sadf        0  34        
2133 dada 0              2nd

$in_file = "input.txt"; 
open (IN, "<$in_file") or die "Can't open $file: $!\n"; 
$out_file = "output.txt"; 
...
} 
close IN; 
close OUT;