a-a a-b aaa aab aah aak aao aar aau aav ab- aba abb abh abk abo abr abu abv aha ahb ahh ahk aho ahr ahu ahv aka akb akh akk ako akr aku akv aoa aob aoh aok aoo aor aou aov ar- ara arb arh ark aro arr aru arv au- aua aub auh auk auo aur auv av- ava avb avh avk avo avr avu b-u baa bab bah bak bao bar bau bav bba bbb bbh bbk bbo bbr bbu bha bhb bhh bhk bho bhr bhu bhv bka bkb bkk bko bkr bkv boa bob boh bok boo bor bou bov bra brb brh brk bro brr bru brv bua bub buh buk buo bur buu bva bvb bvh bvk bvo bvr bvu bvv haa hab hah hak hao har hau hav hba hbb hbh hbk hbo hbr hbu hbv hha hhb hhh hhk hho hhr hhu hhv hka hkb hkh hkk hko hkr hku hoa hob hoh hok hoo hor hou hov hr- hra hrb hrh hrk hro hrr hru hrv hua hub huh huk huo hur huu huv hv- hva hvb hvk hvo hvr hvv ka- kaa kab kah kak kao kar kau kav kba kbb kbh kbk kbo kbr kbu kha khh khk kho khr khu khv kkb kkh kkk kkr kku kkv koa kob koh kok koo kor kou kra krk kro krr kru krv kub kuh kuk kur kuu kva kvb kvh kvk kvo kvr kvv oaa oab oah oak oao oar oau oav ob- oba obb obh obk obo obr obu obv oha ohh oho ohr ohu oka okb okk oko okr oku oo- ooa oob ooh ook ooo oor oov or- ora orb orh ork oro orr oru orv ou- oua ouh ouk ouo our ov- ova ovb ovh ovo ovv ra- raa rab rah rak rao rar rau rav rba rbb rbh rbk rbo rbr rbu rh- rha rhb rhh rho rhr rhu rhv rkb rkk rko rku rkv roa rob roh rok roo ror rou rov rra rrb rrh rrk rrr rru rua rub ruh ruk ruo rur ruu ruv rva rvb rvh rvo rvr rvu rvv ua- uaa uab uah uak uao uar uau uav uba ubb ubh ubk ubo ubr ubu ubv uha uhb uhh uho uhr uhu uhv uka ukb ukk ukr uku uoa uob uok uoo uor ur- ura urb urk uro urr uru uua uur uuu uva uvb uvo uvu uvv v-a vaa vab vah vak vao var vau vav vba vbh vbk vbo vbr vbv vh- vha vhb vho vka vkb voa vob voh vok voo vor vou vov vra vrb vrh vrk vrr vru vuk vur vuv vva vvb vvo vvr vvv