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Notice that:

 

6 + 5 = 11    and    5 + 6 = 11

 

7 + 2 = 9    and    2 + 7 = 9

 

8 + 13 = 21    and    13 + 8 = 21

 

28 + 59 = 87    and    59 + 28 = 87

 

Adding can be done in any order. 

You always get the same answer.

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