-er a-a a-b a-c aaa aab aac aae aam aan aar aau ab- aba abb abc abe abm abn abr abu ac- aca acb acc ace acm acn acr acu aea aeb aec aee aem aen aer aeu ama amb amc ame amm amn amr amu an- ana anb anc ane anm ann anr anu ar- ara arb arc are arm arn arr aru au- aua aub auc aue aum aun aur b-u baa bab bac bae bam ban bar bau bba bbb bbc bbe bbm bbn bbr bbu bca bcb bcc bce bcm bcn bcr bcu be- bea beb bec bee bem ben ber beu bma bmb bmc bme bmm bmn bmr bmu bna bnb bnc bne bnn bnr bnu bra brb bre brm brn brr bru bua bub buc bue bum bun bur buu c-- caa cab cac cae cam can car cau cba cbb cbc cbe cbm cbn cbr cbu cca ccb ccc cce ccm ccn ccr ccu ce- cea ceb cec cee cem cen cer ceu cma cmb cmc cme cmm cmn cmr cmu cn- cna cnb cnc cne cnm cnn cnr cnu cra crb crc cre crm crn crr cru cua cub cuc cue cum cun cur cuu eaa eab eac eae eam ean ear eau eba ebb ebc ebe ebm ebn ebr ebu ec- eca ecb ecc ece ecm ecn ecr ecu eea eeb eec eee eem een eer em- ema emb emc eme emm emn emr emu en- ena enb enc ene enm enn enr enu era erb erc ere erm ern err eru eu- eua eub euc eue eun eur m-r maa mab mac mae mam man mar mau mba mbb mbc mbe mbm mbr mbu mc- mca mcb mcc mce mcm mcn mcr mcu mea meb mec mee mem men mer meu mma mmb mmc mme mmm mmn mmr mmu mna mnb mnc mne mnm mnn mnr mnu mra mrb mrc mre mrm mrn mrr mru mua mub muc mue mum mun mur muu naa nab nac nae nam nan nar nau nba nbb nbc nbe nbm nbn nbr nbu nca ncb ncc nce ncm ncn ncr ncu ne- nea neb nec nee nem nen ner neu nma nmb nmc nme nmm nmn nmr nmu nna nnb nnc nne nnm nnn nnu nra nrb nrc nre nrm nrn nrr nru nua nub nuc nue num nun nur nuu ra- raa rab rac rae ram ran rar rau rba rbb rbc rbe rbm rbn rbr rbu rca rcb rcc rce rcm rcn rcr rcu re- rea reb rec ree rem ren rer reu rma rmb rmc rme rmm rmn rmr rna rnb rnc rnm rnn rnr rnu rra rrb rrc rrm rrn rrr rru rua rub ruc rue rum run rur ruu ua- uaa uab uac uae uam uan uar uau uba ubb ubc ube ubn ubr ubu uca ucb ucc uce ucm ucn ucr ucu uea ueb uec uee uem uen uer um- uma umb umc ume umm umn umr umu un- una unb unc une unm unn unr unu ur- ura urb urc ure urm urn urr uru uua uuc uue uum uun uur uuu