-er a-a a-b aaa aab aad aae aam aao aar aau ab- aba abb abd abe abm abo abr abu ad- ada adb add ade adm ado adr adu aea aeb aed aee aem aeo aer aeu ama amb amd ame amm amo amr amu aoa aob aod aoe aom aoo aor aou ar- ara arb ard are arm aro arr aru au- aua aub aud aue aum auo aur b-u baa bab bad bae bam bao bar bau bba bbb bbd bbe bbm bbo bbr bbu bda bdb bdd bde bdm bdo bdr bdu be- bea beb bed bee bem beo ber beu bma bmb bmd bme bmm bmo bmr bmu boa bob bod boe bom boo bor bou bra brb brd bre brm bro brr bru bua bub bud bue bum buo bur buu daa dab dad dae dam dao dar dau dba dbb dbd dbe dbm dbo dbr dbu dda ddb ddd dde ddm ddo ddr ddu de- dea deb ded dee dem deo der deu dma dmb dmd dme dmm dmo dmr dmu doa dob dod doe dom doo dor dou dra drb drd dre drm dro drr dru dua dub dud due dum duo dur eaa eab ead eae eam eao ear eau eba ebb ebd ebe ebm ebo ebr ebu ed- eda edb edd ede edm edo edr edu eea eeb eed eee eem eeo eer em- ema emb emd eme emm emo emr emu eo- eoa eob eod eoe eom eoo eor eou era erb erd ere erm ero err eru eu- eua eub eud eue eur m-o m-r maa mab mad mae mam mao mar mau mba mbb mbd mbe mbm mbo mbr mbu mda mdb mdd mde mdm mdo mdr mdu mea meb med mee mem meo mer meu mma mmb mmd mme mmm mmo mmr mmu moa mob mod moe mom moo mor mou mra mrb mrd mre mrm mro mrr mru mua mub mud mue mum mur muu oaa oab oad oae oam oao oar oau ob- oba obb obd obe obm obo obr obu oda odb odd ode odm odo odr odu oea oeb oed oee oem oeo oer om- oma omb omd ome omm omo omr omu oo- ooa oob ood oom ooo oor or- ora orb ord ore orm oro orr oru ou- oua oud oue oum ouo our ra- raa rab rad rae ram rao rar rau rba rbb rbd rbe rbm rbo rbr rbu rda rdb rdd rde rdm rdo rdr rdu re- rea reb red ree rem reo rer reu rma rmb rmd rme rmm rmo rmr roa rob rod roe rom roo ror rou rra rrb rrd rrm rrr rru rua rub rud rue rum ruo rur ruu ua- uaa uab uad uae uam uao uar uau uba ubb ube ubo ubr ubu uda udb udd ude udm udo udr udu uea ueb ued uee uem uer um- uma umb umd ume umm umo umr umu uoa uob uod uoe uom uoo uor ur- ura urb urd ure urm uro urr uru uua uue uum uur uuu