Here are a couple of ways: 

print join'',map{ chr 97+rand(6) } 1 .. 2 for 1 .. 100;

## Slightly wasteful, but you only do it once
## and reuse the array each time.

my @pairs = grep{ /[a-f]{2}/ }'aa' .. 'ff'; 
print $pairs[ rand @pairs ];

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In reply to Re^2: Search and replace text by BrowserUk
in thread Search and replace text by nsyed

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