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  1. or download this
    #! perl -slw
use strict;
...
3,70,80,40,50
4,40,70,20,50
5,20,75,40,80
  2. or download this
    C:\test>junk87
1 0 30 20 50
...
4 40 70 20 50
 overlaps
5 20 75 40 80