1sgn 0sgnrb zsgnr ysgn xsgnrb
c2fnrb b2fnr a2fn 91fnrb 81fnr
nbfnr mbfn lbfnrb kbfnr jbfn
yken xkenrb wkenr vken ukenrb
9tdnrb 8tdnr 7tdn 6tdnrb 5tdnr