a-a a-b aaa aab aah aak aao aar aav ab- aba abb abh abk abo abr abv aha ahb ahh ahk aho ahr ahv aka akb akh akk ako akr akv aoa aob aoh aok aoo aor aov ar- ara arb arh ark aro arr arv av- ava avb avh avk avo avr baa bab bah bak bao bar bav bba bbb bbh bbk bbo bbr bha bhb bhh bhk bho bhr bhv bka bkb bkk bko bkr bkv boa bob boh bok boo bor bov bra brb brh brk bro brr brv bva bvb bvh bvk bvo bvr bvv haa hab hah hak hao har hav hba hbb hbh hbk hbo hbr hbv hha hhb hhh hhk hho hhr hhv hka hkb hkh hkk hko hkr hoa hob hoh hok hoo hor hov hr- hra hrb hrh hrk hro hrr hrv hv- hva hvb hvk hvo hvr hvv ka- kaa kab kah kak kao kar kav kba kbb kbh kbk kbo kbr kha khh khk kho khr khv kkb kkh kkk kkr kkv koa kob koh kok koo kor kra krk kro krr krv kva kvb kvh kvk kvo kvr kvv oaa oab oah oak oao oar oav ob- oba obb obh obk obo obr obv oha ohh oho ohr oka okb okk oko okr oo- ooa oob ooh ook ooo oor oov or- ora orb orh ork oro orr orv ov- ova ovb ovh ovo ovv ra- raa rab rah rak rao rar rav rba rbb rbh rbk rbo rbr rh- rha rhb rhh rho rhr rhv rkb rkk rko rkv roa rob roh rok roo ror rov rra rrb rrh rrk rrr rva rvb rvh rvo rvr rvv v-a vaa vab vah vak vao var vav vba vbh vbk vbo vbr vbv vh- vha vhb vho vka vkb voa vob voh vok voo vor vov vra vrb vrh vrk vrr vva vvb vvo vvr vvv