A ||| Adam ||| 1,2,3,4,5
B ||| Bob  ||| 1,2,3,4,5
B ||| Brian ||| 1,2,3,4,5
Carl ||| C ||| 3,2,1,4,5
Bruce ||| B ||| 3,2,1,4,5
C ||| Cheryl ||| 1,2,3,4,5

##</code><code>##

%hash = ( A => [ 'Adam' ],
          B => [ 'Bob', 'Brian', 'Bruce' ],
          C => [ 'Carl', 'Cheryl' ]);

##</code><code>##

letter     names
------------------------
A          Adam
B          Bob;;Brian;;Bruce
C          Carl;;Cheryl

letter     name
------------------------
A          Adam
B          Bob
B          Brian
B          Bruce
C          Carl
C          Cheryl