0 0 0 0 1 0 0 0
0 0 0 1 0 0 0 0
0 0 0 0 0 0 1 0
0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
0 0 1 0 0 0 0 0
0 0 0 0 0 1 0 0
Here is the matrix. I need the row and column index of each one. I can do that. But, for example, I will have (1,5) and (5,1). How do I ensure I only have one of them?