Most Common two letters at the start of a word.

I am looking to go through a document, and find the ___ most common two letters in a set of words.

Lets say that I have a large document, and I want to find the 20 most common two letter pairs that start a word for the document. I am trying to figure out how to tally up and then report on the first two letters.

So if the document was:
Apple Appear Dog

The results would be:
ap 2
do 1

Anyone know how to do a quick sorting like that?
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my %count;
while( <DATA> ){
   ++$count{lc $1} while /\b(\w\w)/g;
my $n;
for( sort{$count{$b}<=>$count{$a} || $a cmp $b} keys %count ){
   last if ++$n>20;
   print "$_ $count{$_}\n";
Apple Appear Dog

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