[1, 1, -1, 3]
[1, 2, -1, 4]
[0, 1, 2, -1]
[2, 1, 1, 2]
II - I ; IV - 2*I
[1, 1, -1, 3]
[0, 1, 0, 1]
[0, 1, 2, -1]
[0, -1, 3, -4]
III - II ; IV + II
[1, 1, -1, 3]
[0, 1, 0, 1]
[0, 0, 2, -2]
[0, 0, 3, -3]
2*IV - 3*III
[1, 1, -1, 3]
[0, 1, 0, 1]
[0, 0, 2, -2]
[0, 0, 0, 0]
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