-er a-a a-b a-c aaa aab aac aae aam aao aar aau ab- aba abb abc abe abm abo abr abu ac- aca acb acc ace acm aco acr acu aea aeb aec aee aem aeo aer aeu ama amb amc ame amm amo amr amu aoa aob aoc aoe aom aoo aor aou ar- ara arb arc are arm aro arr aru au- aua aub auc aue aum auo aur b-u baa bab bac bae bam bao bar bau bba bbb bbc bbe bbm bbo bbr bbu bca bcb bcc bce bcm bco bcr bcu be- bea beb bec bee bem beo ber beu bma bmb bmc bme bmm bmo bmr bmu boa bob boc boe bom boo bor bou bra brb bre brm bro brr bru bua bub buc bue bum buo bur buu c-- caa cab cac cae cam cao car cau cba cbb cbc cbe cbm cbo cbr cbu cca ccb ccc cce ccm cco ccr ccu ce- cea ceb cec cee cem ceo cer ceu cma cmb cmc cme cmm cmo cmr cmu co- coa cob coc coe com coo cor cou cra crb crc cre crm cro crr cru cua cub cuc cue cum cuo cur cuu eaa eab eac eae eam eao ear eau eba ebb ebc ebe ebm ebo ebr ebu ec- eca ecb ecc ece ecm eco ecr ecu eea eeb eec eee eem eeo eer em- ema emb emc eme emm emo emr emu eo- eoa eob eoc eoe eom eoo eor eou era erb erc ere erm ero err eru eu- eua eub euc eue eur m-o m-r maa mab mac mae mam mao mar mau mba mbb mbc mbe mbm mbo mbr mbu mc- mca mcb mcc mce mcm mco mcr mcu mea meb mec mee mem meo mer meu mma mmb mmc mme mmm mmo mmr mmu moa mob moc moe mom moo mor mou mra mrb mrc mre mrm mro mrr mru mua mub muc mue mum mur muu oaa oab oac oae oam oao oar oau ob- oba obb obc obe obm obo obr obu oc- oca ocb occ ocm oco ocr ocu oea oeb oec oee oem oeo oer om- oma omb omc ome omm omo omr omu oo- ooa oob ooc oom ooo oor or- ora orb orc ore orm oro orr oru ou- oua ouc oue oum ouo our ra- raa rab rac rae ram rao rar rau rba rbb rbc rbe rbm rbo rbr rbu rca rcb rcc rce rcm rco rcr rcu re- rea reb rec ree rem reo rer reu rma rmb rmc rme rmm rmo rmr roa rob roc roe rom roo ror rou rra rrb rrc rrm rrr rru rua rub ruc rue rum ruo rur ruu ua- uaa uab uac uae uam uao uar uau uba ubb ubc ube ubo ubr ubu uca ucb ucc uce ucm uco ucr ucu uea ueb uec uee uem uer um- uma umb umc ume umm umo umr umu uoa uob uoc uoe uom uoo uor ur- ura urb urc ure urm uro urr uru uua uuc uue uum uur uuu