http://www.engvid.com/writing-letters-formal-informal-english/
https://www.youtube.com/watch?v=llqPvcciKEM
https://www.youtube.com/watch?v=llqPvcciKEM
http://www.esl-lounge.com/student/reading/3r8-formal-informal-letter.php
http://www.autoenglish.org/writing/formalandinformalexercise.htm
https://www.flo-joe.co.uk/cae/students/writing/register/index.htm
https://eslflow.com/letterwriting.html
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