a-a a-b aaa aab aad aah aak aao aar aav ab- aba abb abd abh abk abo abr abv ad- ada adb add adh adk ado adr adv aha ahb ahd ahh ahk aho ahr ahv aka akb akd akh akk ako akr akv aoa aob aod aoh aok aoo aor aov ar- ara arb ard arh ark aro arr arv av- ava avb avd avh avk avo avr baa bab bad bah bak bao bar bav bba bbb bbd bbh bbk bbo bbr bda bdb bdd bdh bdk bdo bdr bdv bha bhb bhd bhh bhk bho bhr bhv bka bkb bkk bko bkr bkv boa bob bod boh bok boo bor bov bra brb brd brh brk bro brr brv bva bvb bvd bvh bvk bvo bvr bvv daa dab dad dah dak dao dar dav dba dbb dbd dbh dbk dbo dbr dbv dda ddb ddd ddh ddk ddo ddr dh- dha dhb dhd dhh dhk dho dhr dka dkb dkk dko dkr doa dob dod doh dok doo dor dov dra drb drd drk dro drr drv dva dvb dvd dvh dvk dvr haa hab had hah hak hao har hav hba hbb hbd hbh hbk hbo hbr hbv hda hdb hdd hdh hdk hdo hdr hdv hha hhb hhd hhh hhk hho hhr hhv hka hkb hkd hkh hkk hko hkr hoa hob hod hoh hok hoo hor hov hr- hra hrb hrd hrh hrk hro hrr hrv hv- hva hvb hvd hvk hvo hvr hvv ka- kaa kab kad kah kak kao kar kav kba kbb kbd kbh kbk kbo kbr kda kdb kdh kdk kdo kdr kha khh khk kho khr khv kkb kkh kkk kkr kkv koa kob kod koh kok koo kor kra krd krk kro krr krv kva kvb kvh kvk kvo kvr kvv oaa oab oad oah oak oao oar oav ob- oba obb obd obh obk obo obr obv oda odb odd odh odo odr odv oha ohd ohh oho ohr oka okb okd okk oko okr oo- ooa oob ood ooh ook ooo oor oov or- ora orb ord orh ork oro orr orv ov- ova ovb ovd ovh ovo ovv ra- raa rab rad rah rak rao rar rav rba rbb rbd rbh rbk rbo rbr rda rdb rdd rdh rdo rdr rdv rh- rha rhb rhd rhh rho rhr rhv rkb rkk rko rkv roa rob rod roh rok roo ror rov rra rrb rrd rrh rrk rrr rva rvb rvd rvh rvo rvr rvv v-a vaa vab vad vah vak vao var vav vba vbd vbh vbk vbo vbr vbv vdb vdd vdh vdk vdo vdr vdv vh- vha vhb vhd vho vka vkb voa vob vod voh vok voo vor vov vra vrb vrd vrh vrk vrr vva vvb vvo vvr vvv