-er a-a a-b a-c aaa aab aac aad aae aam aan aar aau ab- aba abb abc abd abe abm abn abr abu ac- aca acb acc acd ace acm acn acr acu ad- ada adb adc add ade adm adn adr adu aea aeb aec aed aee aem aen aer aeu ama amb amc amd ame amm amn amr amu an- ana anb anc and ane anm ann anr anu ar- ara arb arc ard are arm arn arr aru au- aua aub auc aud aue aum aun aur b-u baa bab bac bad bae bam ban bar bau bba bbb bbc bbd bbe bbm bbn bbr bbu bca bcb bcc bcd bce bcm bcn bcr bcu bda bdb bdc bdd bde bdm bdr bdu be- bea beb bec bed bee bem ben ber beu bma bmb bmc bmd bme bmm bmn bmr bmu bna bnb bnc bnd bne bnn bnr bnu bra brb brd bre brm brn brr bru bua bub buc bud bue bum bun bur buu c-- caa cab cac cad cae cam can car cau cba cbb cbc cbd cbe cbm cbn cbr cbu cca ccb ccc ccd cce ccm ccn ccr ccu cda cdb cdc cdd cde cdm cdn cdr cdu ce- cea ceb cec ced cee cem cen cer ceu cma cmb cmc cmd cme cmm cmn cmr cmu cn- cna cnb cnc cnd cne cnm cnn cnr cnu cra crb crc crd cre crm crn crr cru cua cub cuc cud cue cum cun cur cuu daa dab dac dad dae dam dan dar dau dba dbb dbc dbd dbe dbm dbn dbr dbu dca dcb dcc dcd dce dcm dcn dcr dcu dda ddb ddc ddd dde ddm ddn ddr ddu de- dea deb dec ded dee dem den der deu dma dmb dmc dmd dme dmm dmn dmr dmu dna dnb dnc dnd dne dnm dnn dnr dra drb drc drd dre drm drn drr dru dua dub duc dud due dum dun dur eaa eab eac ead eae eam ean ear eau eba ebb ebc ebd ebe ebm ebn ebr ebu ec- eca ecb ecc ecd ece ecm ecn ecr ecu ed- eda edb edc edd ede edm edn edr edu eea eeb eec eed eee eem een eer em- ema emb emc emd eme emm emn emr emu en- ena enb enc end ene enm enn enr enu era erb erc erd ere erm ern err eru eu- eua eub euc eud eue eun eur m-r maa mab mac mad mae mam man mar mau mba mbb mbc mbd mbe mbm mbr mbu mc- mca mcb mcc mcd mce mcm mcn mcr mcu mda mdb mdc mdd mde mdm mdn mdr mdu mea meb mec med mee mem men mer meu mma mmb mmc mmd mme mmm mmn mmr mmu mna mnb mnc mne mnm mnn mnr mnu mra mrb mrc mrd mre mrm mrn mrr mru mua mub muc mud mue mum mun mur muu naa nab nac nad nae nam nan nar nau nba nbb nbc nbd nbe nbm nbn nbr nbu nca ncb ncc ncd nce ncm ncn ncr ncu nda ndb ndc ndd nde ndm ndn ndr ndu ne- nea neb nec ned nee nem nen ner neu nma nmb nmc nmd nme nmm nmn nmr nmu nna nnb nnc nne nnm nnn nnu nra nrb nrc nrd nre nrm nrn nrr nru nua nub nuc nud nue num nun nur nuu ra- raa rab rac rad rae ram ran rar rau rba rbb rbc rbd rbe rbm rbn rbr rbu rca rcb rcc rcd rce rcm rcn rcr rcu rda rdb rdc rdd rde rdm rdn rdr rdu re- rea reb rec red ree rem ren rer reu rma rmb rmc rmd rme rmm rmn rmr rna rnb rnc rnd rnm rnn rnr rnu rra rrb rrc rrd rrm rrn rrr rru rua rub ruc rud rue rum run rur ruu ua- uaa uab uac uad uae uam uan uar uau uba ubb ubc ube ubn ubr ubu uca ucb ucc ucd uce ucm ucn ucr ucu uda udb udc udd ude udm udn udr udu uea ueb uec ued uee uem uen uer um- uma umb umc umd ume umm umn umr umu un- una unb unc und une unm unn unr unu ur- ura urb urc urd ure urm urn urr uru uua uuc uue uum uun uur uuu