1
1
0
4
0 4 R1+ R2
0
-4
1
-16
4
0
2
-2
2
1 2 R3+ R2
0
0
1
2
1
4
0
1
0
4
0
-4
1
-16
4
0
0
-3
-12
61

3
R3
0
0
1
2
1


Close this window to return to the tutorial.