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This is an informal letter so here you go 

Dear grandpa,
Hello, how are you ? We are good here and hope the same for you too. I am writing this letter to you because I wanted to tell toy about my favorite book ultimate gift. It includes many characters and is basically a friction book . By reading it in my mind came you. I am also very thankful to you for that book you gave me on my birthday. God bless you
With love,
Your grandson / granddaughter 
(Your name)
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