A.SlockA…SlockB…XlockC…UnlockA…UnlockB…UnlockC
B.SlockA…SlockB…XlockC…UnlockC…UnlockB…UnlockA
C.SlockA…SlockB…XlockC…UnlockB…UnlockC…UnlockA
D.SlockA…UnlockA……SlockB…XlockC…UnlockB…UnlockC