2strp 1str 0strp1 zstrp ystr

d2sr c2srp1 b2srp a2sr 91srp1

obsrp1 nbsrp mbsr lbsrp1 kbsrp

zkrrp ykrr xkrrp1 wkrrp vkrr

auqr 9tqrp1 8tqrp 7tqr 6tqrp1