Terms

1+1, 2 + 2, 3 + 4, 4 + 3, 5 + 6, 6 + 5, 7 + 7, 8 + 8

1+1, 2 + 2, 3 + 4, 4 + 3, 5 + 6, 6 + 5, 7 + 7, 8 + 8   
 
7                                                                                                   8
 
                     5                       1 - 1                       4
                     6                                                      3
 
 
 
 
 
                    3                                                      6
                    4                                                      5
 
                                              2 -2
 
8                                                                                                     7
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