Question: transform a to upper triangular matrix with 1 along the diagonal a=[[-1, -5, -1, 6], [0, 4, 4, -2], [-3, -11, -1, 22], [-3, -15,

transform a to upper triangular matrix with 1 along the diagonal

a=[[-1, -5, -1, 6],

[0, 4, 4, -2],

[-3, -11, -1, 22],

[-3, -15, 1, -4]

]

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