-er a-a a-b aaa aab aae aam aao aar aau ab- aba abb abe abm abo abr abu aea aeb aee aem aeo aer aeu ama amb ame amm amo amr amu aoa aob aoe aom aoo aor aou ar- ara arb are arm aro arr aru au- aua aub aue aum auo aur b-u baa bab bae bam bao bar bau bba bbb bbe bbm bbo bbr bbu be- bea beb bee bem beo ber beu bma bmb bme bmm bmo bmr bmu boa bob boe bom boo bor bou bra brb bre brm bro brr bru bua bub bue bum buo bur buu eaa eab eae eam eao ear eau eba ebb ebe ebm ebo ebr ebu eea eeb eee eem eeo eer em- ema emb eme emm emo emr emu eo- eoa eob eoe eom eoo eor eou era erb ere erm ero err eru eu- eua eub eue eur m-o m-r maa mab mae mam mao mar mau mba mbb mbe mbm mbo mbr mbu mea meb mee mem meo mer meu mma mmb mme mmm mmo mmr mmu moa mob moe mom moo mor mou mra mrb mre mrm mro mrr mru mua mub mue mum mur muu oaa oab oae oam oao oar oau ob- oba obb obe obm obo obr obu oea oeb oee oem oeo oer om- oma omb ome omm omo omr omu oo- ooa oob oom ooo oor or- ora orb ore orm oro orr oru ou- oua oue oum ouo our ra- raa rab rae ram rao rar rau rba rbb rbe rbm rbo rbr rbu re- rea reb ree rem reo rer reu rma rmb rme rmm rmo rmr roa rob roe rom roo ror rou rra rrb rrm rrr rru rua rub rue rum ruo rur ruu ua- uaa uab uae uam uao uar uau uba ubb ube ubo ubr ubu uea ueb uee uem uer um- uma umb ume umm umo umr umu uoa uob uoe uom uoo uor ur- ura urb ure urm uro urr uru uua uue uum uur uuu