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  • Julio Novais Raffaine thinks this is interesting:

To clear the third column of 1’s, we are going to “add” the second equation to Equations (i), (iii), (iv), (v), and (vi).

From

Cover of Quantum Computing for Computer Scientists

Note

This looks wrong, first because despite equation 1, all others don't have 1 in the third column, and if one look at the results, all other equations (except 1) are exactly the same.