8 = 
7 + 6 = (
6 + 5) + 6 = ((
5 + 4) + 5) + (5 + 4) = 3
5 + 24 = 3(
4 + 3) + 2(3 + 2) = 
(34 + 33) + (23 + 22) = 3
4 + 53 + 22 = 3(
3 + 2) + 53 + 22 = (3
3 + 32) + 53 + 22 = 8
3 + 52 = 
8(2 + ) + 5( + 1) = (8
2 + 8) + (5 + 5) = 8
2 + 13 + 5 = 8(
+ 1) + 13 + 5 = (8
+ 8) + 13 + 5 = 21
+ 13
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