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use strict;
use warnings;
...
   map  { qq{$_: $letterFreq{ $_ }\n} }
   sort { $letterFreq{ $b } <=> $letterFreq{ $a } || $a cmp $b }
   keys %letterFreq;

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```
x: 3
y: 2
...
r: 1
t: 1
w: 1
```