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                                                                                     Dt 24th Dec 2015

The Principal
ABC School,

Sub: Application for 3 days leave

Respected Sir,  
My grandmother who lives in Mumbai, India, and she is sick for the last few weeks. I wish to visit her during 1st Jan to 3rd Jan 2016 and therefore I will be unable to attend my classes.  

Kindly grant me leave for three days.
Your sincerely