-er a-a a-b a-c aaa aab aac aae aam aan aao aar aau ab- aba abb abc abe abm abn abo abr abu ac- aca acb acc ace acm acn aco acr acu aea aeb aec aee aem aen aeo aer aeu ama amb amc ame amm amn amo amr amu an- ana anb anc ane anm ann ano anr anu aoa aob aoc aoe aom aon aoo aor aou ar- ara arb arc are arm arn aro arr aru au- aua aub auc aue aum aun auo aur b-u baa bab bac bae bam ban bao bar bau bba bbb bbc bbe bbm bbn bbo bbr bbu bca bcb bcc bce bcm bcn bco bcr bcu be- bea beb bec bee bem ben beo ber beu bma bmb bmc bme bmm bmn bmo bmr bmu bna bnb bnc bne bnn bno bnr bnu boa bob boc boe bom bon boo bor bou bra brb bre brm brn bro brr bru bua bub buc bue bum bun buo bur buu c-- caa cab cac cae cam can cao car cau cba cbb cbc cbe cbm cbn cbo cbr cbu cca ccb ccc cce ccm ccn cco ccr ccu ce- cea ceb cec cee cem cen ceo cer ceu cma cmb cmc cme cmm cmn cmo cmr cmu cn- cna cnb cnc cne cnm cnn cno cnr cnu co- coa cob coc coe com con coo cor cou cra crb crc cre crm crn cro crr cru cua cub cuc cue cum cun cuo cur cuu eaa eab eac eae eam ean eao ear eau eba ebb ebc ebe ebm ebn ebo ebr ebu ec- eca ecb ecc ece ecm ecn eco ecr ecu eea eeb eec eee eem een eeo eer em- ema emb emc eme emm emn emo emr emu en- ena enb enc ene enm enn eno enr enu eo- eoa eob eoc eoe eom eon eoo eor eou era erb erc ere erm ern ero err eru eu- eua eub euc eue eun eur m-o m-r maa mab mac mae mam man mao mar mau mba mbb mbc mbe mbm mbo mbr mbu mc- mca mcb mcc mce mcm mcn mco mcr mcu mea meb mec mee mem men meo mer meu mma mmb mmc mme mmm mmn mmo mmr mmu mna mnb mnc mne mnm mnn mno mnr mnu moa mob moc moe mom mon moo mor mou mra mrb mrc mre mrm mrn mro mrr mru mua mub muc mue mum mun mur muu naa nab nac nae nam nan nao nar nau nba nbb nbc nbe nbm nbn nbo nbr nbu nca ncb ncc nce ncm ncn nco ncr ncu ne- nea neb nec nee nem nen neo ner neu nma nmb nmc nme nmm nmn nmo nmr nmu nna nnb nnc nne nnm nnn nno nnu no- noa nob noc noe nom non noo nor nou nra nrb nrc nre nrm nrn nro nrr nru nua nub nuc nue num nun nuo nur nuu oaa oab oac oae oam oan oao oar oau ob- oba obb obc obe obm obn obo obr obu oc- oca ocb occ ocm ocn oco ocr ocu oea oeb oec oee oem oen oeo oer om- oma omb omc ome omm omn omo omr omu on- ona onb onc one onn ono onr onu oo- ooa oob ooc oom oon ooo oor or- ora orb orc ore orm orn oro orr oru ou- oua ouc oue oum oun ouo our ra- raa rab rac rae ram ran rao rar rau rba rbb rbc rbe rbm rbn rbo rbr rbu rca rcb rcc rce rcm rcn rco rcr rcu re- rea reb rec ree rem ren reo rer reu rma rmb rmc rme rmm rmn rmo rmr rna rnb rnc rnm rnn rno rnr rnu roa rob roc roe rom ron roo ror rou rra rrb rrc rrm rrn rrr rru rua rub ruc rue rum run ruo rur ruu ua- uaa uab uac uae uam uan uao uar uau uba ubb ubc ube ubn ubo ubr ubu uca ucb ucc uce ucm ucn uco ucr ucu uea ueb uec uee uem uen uer um- uma umb umc ume umm umn umo umr umu un- una unb unc une unm unn uno unr unu uoa uob uoc uoe uom uon uoo uor ur- ura urb urc ure urm urn uro urr uru uua uuc uue uum uun uur uuu