letter writing formal

Answers
your address
name of your institution
p.o box no.
place
date
recipient address
title of recipient
p.o.box no
place
dear .......
RE:........................................................................................................
Body
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yours faithfully,
(sign)
name
33-AIreo Villas
Canal Road
Madurai,Tamil Nadu
19 February 2019
The Divisional Forest officer
Respected Sir,
Subject:- Taking permission and making book for weekend visit. (or any other subject you can write)
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Yours Truly
ABC