P(1/4)
 A1(1/4) B1(1/4) C2(1/4) E2(1/2) D2(1/4)
 P(1/2.)
P(1/4) A1(1/4) B1(1/4) C2(1/4) E2(1/2) D2(1/4)
 P(1/2.)
G2(1/4) F2(1/4) E2(1/4) E2(1/2) B1(1/4)
P(1/2.)
G2(1/4) F2(1/4) E2(1/4) E2(1/1)