a-a a-b a-t aaa aab aak aao aar aat aau aav ab- aba abb abk abo abr abt abu abv aka akb akk ako akr aku akv aoa aob aok aoo aor aot aou aov ar- ara arb ark aro arr art aru arv at- ata atb ato atr att atu atv au- aua aub auk auo aur aut auv av- ava avb avk avo avr avt avu b-u baa bab bak bao bar bat bau bav bba bbb bbk bbo bbr bbt bbu bka bkb bkk bko bkr bkt bkv boa bob bok boo bor bot bou bov bra brb brk bro brr brt bru brv bta btb btk bto btr btt btu btv bua bub buk buo bur but buu bva bvb bvk bvo bvr bvt bvu bvv k-t ka- kaa kab kak kao kar kat kau kav kba kbb kbk kbo kbr kbu kkb kkk kkr kkt kku kkv koa kob kok koo kor kot kou kra krk kro krr krt kru krv kta ktb ktk kto ktr ktt ktu ktv kub kuk kur kut kuu kva kvb kvk kvo kvr kvv oaa oab oak oao oar oat oau oav ob- oba obb obk obo obr obt obu obv oka okb okk oko okr oku oo- ooa oob ook ooo oor oot oov or- ora orb ork oro orr ort oru orv ot- ota otb otk oto otr ott otu otv ou- oua ouk ouo our out ov- ova ovb ovo ovv ra- raa rab rak rao rar rat rau rav rba rbb rbk rbo rbr rbt rbu rkb rkk rko rkt rku rkv roa rob rok roo ror rot rou rov rra rrb rrk rrr rrt rru rta rtb rtk rto rtr rtt rtu rtv rua rub ruk ruo rur rut ruu ruv rva rvb rvo rvr rvt rvu rvv taa tab tak tao tar tat tau tav tba tbb tbk tbo tbr tbt tbu tbv tka tkb tkk tko tkr tkt to- toa tob tok too tor tot tou tov tra trb trk tro trr trt tru trv tta ttb ttk tto ttr ttt ttu ttv tua tub tuk tuo tur tut tuu tuv tva tvb tvk tvo tvr tvt tvu ua- uaa uab uak uao uar uat uau uav uba ubb ubk ubo ubr ubt ubu ubv uka ukb ukk ukr uku uoa uob uok uoo uor uot ur- ura urb urk uro urr urt uru uta utb utk uto utr utt utu utv uua uur uut uuu uva uvb uvo uvu uvv v-a vaa vab vak vao var vat vau vav vba vbk vbo vbr vbv vka vkb vkt voa vob vok voo vor vot vou vov vra vrb vrk vrr vrt vru vta vtb vtk vto vtr vtt vtu vtv vuk vur vut vuv vva vvb vvo vvr vvt vvv