VN member 1	L1-L4 (via S3, S4, and S5)
VN member 2	L1-L7 (via S3, S4, S7, and S8)
VN member 3	L2-L7 (via S9, S10, and S11)
VN member 4	L3-L8 (via S9, S10, and S11)