0zevxn zzevx yzev xzevxn wzevx
b9dvx a9dv 98dvxn 88dvx 78dv
midv lidvxn kidvx jidv iidvxn
xrcvxn wrcvx vrcv urcvxn trcvx
80bvx 70bv 60bvxn 50bvx 40bv