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#!/usr/bin/perl
use warnings;
...
B 11 15
C 5  10
D 10 20

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~/perl/monks$ ./ranges.pl
ID  1  2  3  5  7 10 11 15 20
...
B   0  0  1  1  0  0  1  1  0
C   0  0  0  1  1  1  0  0  0
D   0  0  0  0  0  1  1  1  1