Find frequency of letters appearing in 5-letter words in the English language
Inspired by Wordle game
List of words in English
https://github.com/dwyl/english-words/blob/master/words_alpha.txt
List of words in PTBR
https://www.ime.usp.br/~pf/dicios/index.html
Then generated 5-letter words with
grep -E '^[[:alpha:]]{5}$' words_alpha.txt > words_len5.txt
Two words that contain the 10 most common letters (ENG) are:
UTILE and SONAR
