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[ 2 4 -6 0]
[ 4 6 -3 -4]
[ 0 0 4 0]
[ 0 4 -6 2]
[6, 4, 2, 2]
[6|0|0 0]
[-+-+---]
[0|4|0 0]
[-+-+---]
[0|0|2 1]
[0|0|0 2]
[1 0 4 0]
[1 3 0 1]
[0 2 0 0]
[1 0 4 1]
[ 2 4 -6 0]
[ 4 6 -3 -4]
[ 0 0 4 0]
[ 0 4 -6 2]
[6 0 0 0]
[0 4 0 0]
[0 0 2 1]
[0 0 0 2]