a-a a-t aaa aak aao aar aat aka akk ako akr aoa aok aoo aor aot ar- ara ark aro arr art at- ata ato atr att k-t ka- kaa kak kao kar kat kkk kkr kkt koa kok koo kor kot kra krk kro krr krt kta ktk kto ktr ktt oaa oak oao oar oat oka okk oko okr oo- ooa ook ooo oor oot or- ora ork oro orr ort ot- ota otk oto otr ott ra- raa rak rao rar rat rkk rko rkt roa rok roo ror rot rra rrk rrr rrt rta rtk rto rtr rtt taa tak tao tar tat tka tkk tko tkr tkt to- toa tok too tor tot tra trk tro trr trt tta ttk tto ttr ttt