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[M] Find a column of the matrix in Exercise 39 that can be deleted and yet have the remaining matrix columns still span R4.

[M] Find a column of the matrix in Exercise 39 that can be deleted and yet have the remaining matrix columns still span R4. 10 -7 1 4 6 -8 4 -6-10 -3 -7 11 -5 -1 -8 3 -1 10 12 12

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