a-a a-b aaa aab aah aak aao aas aav ab- aba abb abh abk abo abs abv aha ahb ahh ahk aho ahs ahv aka akb akh akk ako aks akv aoa aob aoh aok aoo aos aov as- asa asb ash ask aso ass asv av- ava avb avh avk avo avs baa bab bah bak bao bas bav bba bbb bbh bbk bbo bbs bha bhb bhh bhk bho bhs bhv bka bkb bkk bko bks bkv boa bob boh bok boo bos bov bsa bsb bsh bsk bso bss bsv bva bvb bvh bvk bvo bvs bvv haa hab hah hak hao has hav hba hbb hbh hbk hbo hbs hbv hha hhb hhh hhk hho hhs hhv hka hkb hkh hkk hko hks hoa hob hoh hok hoo hos hov hsa hsb hsh hsk hss hsv hv- hva hvb hvk hvo hvs hvv ka- kaa kab kah kak kao kas kav kba kbb kbh kbk kbo kbs kha khh khk kho khs khv kkb kkh kkk kks kkv koa kob koh kok koo kos ksa ksb ksh ksk kso kss ksv kva kvb kvh kvk kvo kvs kvv oaa oab oah oak oao oas oav ob- oba obb obh obk obo obs obv oha ohh oho ohs oka okb okk oko oks oo- ooa oob ooh ook ooo oos oov os- osa osb osh osk oso oss osv ov- ova ovb ovh ovo ovs ovv saa sab sah sak sao sas sav sba sbb sbh sbk sbo sbs sbv sh- sha shb shh shk sho shs shv sk- ska skb skh skk sko sks soa sob soh sok soo sos sov ss- ssa ssb ssh ssk sso sss ssv sva svb svk svo svs svv v-a vaa vab vah vak vao vas vav vba vbh vbk vbo vbs vbv vh- vha vhb vho vhs vka vkb voa vob voh vok voo vos vov vsa vsb vsh vsk vso vss vsv vva vvb vvo vvs vvv