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3 -2 3 6 -1
2 0 1 5 -3
1 6 -4 -1 4 r1-r2,r2-3r4,r3-2r4
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0 -20 15 9 -13
0 -12 9 7 -11
1 6 -4 -1 4 r2+5r1,r3+3r1
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0 4 -3 -1 1
0 0 0 4 -8
0 0 0 4 -8
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0 0 0 1 -2
0 0 0 0 0
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3 -2 6
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