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  1. or download this
    00112233222000
  2. or download this
    (3,1), (5,2), (7,3), (9,2), (12,0)
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    my @intervals = ([3,11], [5,8], [7,11]);
for (@intervals) {
...
    $total += $delta{$_};
    push @points, [$_, $total];
}