x

C1x

P1x

R1x

M1x

U1x

S1x

S2x

D1x

V1x

P2x

N1x

N2x

g

b

g

g

b

g

g

g

g

g

b

b

b

b

g

b

b

g

b

b

b

b

b

g

g

b