A.2.7 B.2.8 C.2.6 D.2.5
A.1/3~2/3 B.1/2~2/3 C.1/4~2/3 D.1/2~1/3
A.1/4~1/2 B.2/3~1/2 C.1/2~1/3 D.1/3~1/2