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  1. or download this
    use strict;
use warnings;
...
for A. This means that instead of looking through all of B, you simply
+ need to
retrieve all records from B which start with the same first letter as 
+the
current record in A.
  2. or download this
    b: 458 499
c: 822 900, 1053 1074
...
r: 979 1053
s: 573 651
t: 499 573