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  1. or download this
    use DB_File ;

...
$key <= $half ? $db->seq($key, $value, R_NEXT)
              : $db->seq($key, $value, R_PREV);
print "$key -> $value\n";
  2. or download this
    Max: 302 -> -2.4
151 -> -2.1
165 -> -2.5