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n     X
 1.@-12  -9_
 2.@  0^    _
 3.  5   8
 4.@  0^  -7
 5. 16   2
 6. 18^   4
 7.@ -3^ -10
 8.@-12^    
 9. 16  17
10.  6   0
11.@-12    _
12.-12    

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