There's been some complaints that letter frequencies were not made available. Being CS-types, I expected you to be able to write the short C, C++, Java, perl, or whatever language programs to calculate this over your own sample text, e.g., email, web pages, etc. Included below is a perl program to compute letter frequencies; if you think you need digram frequencies, you can write it / extend it yourself, though you should be able to, by using common sense / observations of actual English text, guess what the more frequent letter pairs that you'd encounter.
perl -e ' while (<>) { tr/A-Z/a-z/; tr/a-z//cd; @chars=split / */,$_; for $letter (@chars) { $freq{$letter}++; } } for $letter (keys %freq) { print "$letter: ",$freq{$letter},"\n"; } '
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