a-a a-b aaa aab aad aak aam aao aar aau ab- aba abb abd abk abm abo abr abu ad- ada adb add adk adm ado adr adu aka akb akd akk akm ako akr aku ama amb amd amk amm amo amr amu aoa aob aod aok aom aoo aor aou ar- ara arb ard ark arm aro arr aru au- aua aub aud auk aum auo aur b-u baa bab bad bak bam bao bar bau bba bbb bbd bbk bbm bbo bbr bbu bda bdb bdd bdk bdm bdo bdr bdu bka bkb bkk bkm bko bkr bma bmb bmd bmk bmm bmo bmr bmu boa bob bod bok bom boo bor bou bra brb brd brk brm bro brr bru bua bub bud buk bum buo bur buu daa dab dad dak dam dao dar dau dba dbb dbd dbk dbm dbo dbr dbu dda ddb ddd ddk ddm ddo ddr ddu dka dkb dkk dkm dko dkr dku dma dmb dmd dmk dmm dmo dmr dmu doa dob dod dok dom doo dor dou dra drb drd drk drm dro drr dru dua dub dud duk dum duo dur ka- kaa kab kad kak kam kao kar kau kba kbb kbd kbk kbm kbo kbr kbu kda kdb kdk kdm kdo kdr kdu kkb kkk kkm kkr kku kma kmb kmd kmk kmm kmo kmu koa kob kod kok kom koo kor kou kra krd krk kro krr kru kub kud kuk kum kur kuu m-o m-r maa mab mad mak mam mao mar mau mba mbb mbd mbk mbm mbo mbr mbu mda mdb mdd mdk mdm mdo mdr mdu mka mkb mkd mkk mkm mko mkr mku mma mmb mmd mmk mmm mmo mmr mmu moa mob mod mok mom moo mor mou mra mrb mrd mrk mrm mro mrr mru mua mub mud muk mum mur muu oaa oab oad oak oam oao oar oau ob- oba obb obd obk obm obo obr obu oda odb odd odm odo odr odu oka okb okd okk oko okr oku om- oma omb omd omm omo omr omu oo- ooa oob ood ook oom ooo oor or- ora orb ord ork orm oro orr oru ou- oua oud ouk oum ouo our ra- raa rab rad rak ram rao rar rau rba rbb rbd rbk rbm rbo rbr rbu rda rdb rdd rdm rdo rdr rdu rkb rkk rkm rko rku rma rmb rmd rmm rmo rmr roa rob rod rok rom roo ror rou rra rrb rrd rrk rrm rrr rru rua rub rud ruk rum ruo rur ruu ua- uaa uab uad uak uam uao uar uau uba ubb ubk ubo ubr ubu uda udb udd udk udm udo udr udu uka ukb ukk ukr uku um- uma umb umd umm umo umr umu uoa uob uod uok uom uoo uor ur- ura urb urd urk urm uro urr uru uua uum uur uuu