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                                                                                          Dt. 11. 12.15
The Principal
ABC School,
New Delhi  

Sub: Application for leave

Respected Sir,

I was diagnosed jaundice today and my doctor has advised 10 days bed rest. Therefore, I may not attend my classes from 12th December 2015 to 21st December 2015.

Kindly grant me leave for the next 10 days.

Thanking you,  
Yours faithfully