97cr1y a8cr b8cr1 c8cr1y d8cr
yydr zydr1 0ydr1y 1ydr 2ydr1
nper1 oper1y pper qper1 rper1y
cgfr1y dgfr egfr1 fgfr1y ggfr
16fr 26fr1 36fr1y 46fr 56fr1