A.6X17+1 B.6X27+1 C.6X19+1 D.6X37+1
A.1/4 B.1/2 C.1 D.2
A.nb>4.0,ns>3.0 B.nb>3.0,ns>1.6 C.nb>3.0,ns>4.0 D.nb>1.6,ns>3.0