What is the value of Sunday ?

What's the value of Sunday ?

If... Then...

What's the value of Sunday ?

Monday = 617
Tuesday = 729
Wednesday = 9312
Thursday = 8412
Friday = 6511
Saturday = 8614
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Sunday = ???

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Answer is Sunday = 6713
Logic :
6 - Number of letters in Sunday
7 - 7th Day of the week starting Monday
13 - 6+7 = 13
So the value of Sunday is 6713