-er a-a a-b a-c aaa aab aac aad aae aam aar aau ab- aba abb abc abd abe abm abr abu ac- aca acb acc acd ace acm acr acu ad- ada adb adc add ade adm adr adu aea aeb aec aed aee aem aer aeu ama amb amc amd ame amm amr amu ar- ara arb arc ard are arm arr aru au- aua aub auc aud aue aum aur b-u baa bab bac bad bae bam bar bau bba bbb bbc bbd bbe bbm bbr bbu bca bcb bcc bcd bce bcm bcr bcu bda bdb bdc bdd bde bdm bdr bdu be- bea beb bec bed bee bem ber beu bma bmb bmc bmd bme bmm bmr bmu bra brb brd bre brm brr bru bua bub buc bud bue bum bur buu c-- caa cab cac cad cae cam car cau cba cbb cbc cbd cbe cbm cbr cbu cca ccb ccc ccd cce ccm ccr ccu cda cdb cdc cdd cde cdm cdr cdu ce- cea ceb cec ced cee cem cer ceu cma cmb cmc cmd cme cmm cmr cmu cra crb crc crd cre crm crr cru cua cub cuc cud cue cum cur cuu daa dab dac dad dae dam dar dau dba dbb dbc dbd dbe dbm dbr dbu dca dcb dcc dcd dce dcm dcr dcu dda ddb ddc ddd dde ddm ddr ddu de- dea deb dec ded dee dem der deu dma dmb dmc dmd dme dmm dmr dmu dra drb drc drd dre drm drr dru dua dub duc dud due dum dur eaa eab eac ead eae eam ear eau eba ebb ebc ebd ebe ebm ebr ebu ec- eca ecb ecc ecd ece ecm ecr ecu ed- eda edb edc edd ede edm edr edu eea eeb eec eed eee eem eer em- ema emb emc emd eme emm emr emu era erb erc erd ere erm err eru eu- eua eub euc eud eue eur m-r maa mab mac mad mae mam mar mau mba mbb mbc mbd mbe mbm mbr mbu mc- mca mcb mcc mcd mce mcm mcr mcu mda mdb mdc mdd mde mdm mdr mdu mea meb mec med mee mem mer meu mma mmb mmc mmd mme mmm mmr mmu mra mrb mrc mrd mre mrm mrr mru mua mub muc mud mue mum mur muu ra- raa rab rac rad rae ram rar rau rba rbb rbc rbd rbe rbm rbr rbu rca rcb rcc rcd rce rcm rcr rcu rda rdb rdc rdd rde rdm rdr rdu re- rea reb rec red ree rem rer reu rma rmb rmc rmd rme rmm rmr rra rrb rrc rrd rrm rrr rru rua rub ruc rud rue rum rur ruu ua- uaa uab uac uad uae uam uar uau uba ubb ubc ube ubr ubu uca ucb ucc ucd uce ucm ucr ucu uda udb udc udd ude udm udr udu uea ueb uec ued uee uem uer um- uma umb umc umd ume umm umr umu ur- ura urb urc urd ure urm urr uru uua uuc uue uum uur uuu