R4 0 2 R4
V1 2 0 step
R1 4 0 R1
R5 3 0 R5
R2 0 5 R2
G1 5 3 4 0 x_1
R6 4 5 R6
G2 4 6 4 0 x_2
L1 7 5 L1
R3 8 5 R3
R7 6 7 R7
R8 7 8 R8