0 -> As As -> 0 As -> 0 0 -> As As -> 0 0 -> As As -> 0 0 -> As As -> 0 0 -> As 0 -> Bs Bs -> 0 0 -> Bs Bs -> 0 0 -> Bs Bs -> 0 Bs -> 0 0 -> Bs 0 -> Asyn Asyn -> 0 Asyn -> 0 0 -> Asyn Asyn -> 0 0 -> Asyn Asyn -> 0 0 -> Asyn 0 -> Bsyn Bsyn -> 0 0 -> Bsyn Bsyn -> 0 0 -> Bsyn Bsyn -> 0 Bsyn -> 0 0 -> Bsyn