text=: ' i sing of olaf glad and big'
   alph=: ' abcdefghijklmnopqrstuvwxyz'
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   ]LF=: 2 13 $ +/"1 alph =/ text       Letter frequency table
7 3 1 0 2 0 2 3 0 3 0 0 2
0 2 2 0 0 0 1 0 0 0 0 0 0

   +/+/LF
28

   $text
28