s/[qz]/kk/
s/[jx]/kb/g
s/k/bd/g
s/[fhvwy]/dd/g
s/[bcmp]/da/g
s/[dg]/aa/g
s/^/0/
s/.\{21\}/20/
s/.\{11\}/10/
s/$/9876543210/
s/0.\{9\}\(.\).*/\1/