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      | 1-2   4-8
----------------
1-2   |  a     b
4-8   |  c     d
16-32 |  e     f

my $row_map = [{min =>  1, max =>  2},
               {min =>  4, max =>  8},
...
      ($row_map->[$_]->{max} >= $y))
  { $row = $_; last }
}