Between V0 and V2, is V0 the cause?
Between V1 and V6, is V1 the cause?
Between V2 and V3, is V2 the cause?
Between V3 and V4, is V3 the cause?
Between V3 and V6, is V3 the cause?
Between V4 and V7, is V4 the cause?
Between V5 and V7, is V5 the cause?
Between V6 and V8, is V6 the cause?
