4
0
1
0
4 R1 + R3
0
-4
1
-16
4 R2 + R3
0
0
-1
-4
2
0
0
1
2
1 R4 + R3
4
0
0
-4
6 1

2		R1
0
-4
0
-20
6 1

2		R2
0
0
-1
-4
2
0
0
0
-2
3
2
0
0
-2
3 R1-R4
0
-2
0
-10
3 R2-5 R4
0
0
-1
-4
2 R3-2 R4
0
0
0
-2
3
2
0
0
0
0 1

2		R1
0
-2
0
0
-12 1

2		R2
0
0
-1
0
-4
0
0
0
-2
3

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