a-a aaa aak aao aar aaw aax aka akk ako akr akw aoa aok aoo aor aow aox ar- ara ark aro arr arw arx aw- awa awk awo awr aww ax- axa axk axo axr axx ka- kaa kak kao kar kaw kax kkk kkr koa kok koo kor kow kra krk kro krr krw kw- kwa kwk kwo kww kxo oaa oak oao oar oaw oax oka okk oko okr okw oo- ooa ook ooo oor oow oox or- ora ork oro orr orx owa owk owo oww ox- oxa oxo oxx ra- raa rak rao rar raw rax rkk rko roa rok roo ror row rox rra rrk rrr rwa rwr rxr waa wak wao war waw wax wka wko wkr wkw woa wok woo wor wow wox wr- wra wrk wro wrr wrw wrx wwa wwo www wxw xaa xak xar xoa xok xoo xor xox xrx xwa xxo xxx