a-a a-c a-z aaa aac aao aaw aaz ac- aca acc aco acw acz aoa aoc aoo aow aw- awa awc awo aww az- aza azo azw azz c-- caa cac cao caw caz cca ccc cco ccw ccz co- coa coc coo cow coz cw- cwa cwc cwo cz- czc czo czw oaa oac oao oaw oc- oca occ oco ocw ocz oo- ooa ooc ooo oow owa owc owo oww oza ozo ozw ozz waa wac wao waw waz wca wcc wco wcw woa woc woo wow woz wwa wwc wwo www wzc zaa zac zao zaz zco zo- zoa zoc zoo zow zzz