2zunw 1zun 0zunwk zzunw yzun
d9tn c9tnwk b9tnw a9tn 98tnwk
oitnwk nitnw mitn litnwk kitnw
zrsnw yrsn xrsnwk wrsnw vrsn
a1rn 90rnwk 80rnw 70rn 60rnwk