-er a-a a-b a-c aaa aab aac aae aag aam aar aau ab- aba abb abc abe abg abm abr abu ac- aca acb acc ace acg acm acr acu aea aeb aec aee aeg aem aer aeu ag- aga agb agc age agg agm agr agu ama amb amc ame amg amm amr amu ar- ara arb arc are arg arm arr aru au- aua aub auc aue aug aum aur b-u baa bab bac bae bag bam bar bau bba bbb bbc bbe bbg bbm bbr bbu bca bcb bcc bce bcg bcm bcr bcu be- bea beb bec bee beg bem ber beu bga bgb bgc bge bgg bgm bgr bgu bma bmb bmc bme bmg bmm bmr bmu bra brb bre brg brm brr bru bua bub buc bue bug bum bur buu c-- caa cab cac cae cag cam car cau cba cbb cbc cbe cbg cbm cbr cbu cca ccb ccc cce ccg ccm ccr ccu ce- cea ceb cec cee ceg cem cer ceu cga cgb cgc cge cgg cgm cgr cgu cma cmb cmc cme cmg cmm cmr cmu cra crb crc cre crg crm crr cru cua cub cuc cue cug cum cur cuu eaa eab eac eae eag eam ear eau eba ebb ebc ebe ebg ebm ebr ebu ec- eca ecb ecc ece ecg ecm ecr ecu eea eeb eec eee eeg eem eer ega egb egc ege egg egm egr egu em- ema emb emc eme emg emm emr emu era erb erc ere erg erm err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gam gar gau gba gbc gbe gbg gbm gbr gbu gca gcb gcc gce gcg gcm gcr gcu ge- gea geb gec gee geg gem ger geu gga ggb ggc ggg ggm ggr ggu gma gmb gmc gme gmg gmm gmr gra grb grc gre grg grm grr gru gu- gua gub guc gue gug gum gur guu m-r maa mab mac mae mag mam mar mau mba mbb mbc mbe mbg mbm mbr mbu mc- mca mcb mcc mce mcg mcm mcr mcu mea meb mec mee meg mem mer meu mga mgb mgc mge mgm mgr mgu mma mmb mmc mme mmg mmm mmr mmu mra mrb mrc mre mrg mrm mrr mru mua mub muc mue mug mum mur muu ra- raa rab rac rae rag ram rar rau rba rbb rbc rbe rbg rbm rbr rbu rca rcb rcc rce rcg rcm rcr rcu re- rea reb rec ree reg rem rer reu rga rgb rgc rge rgg rgr rma rmb rmc rme rmg rmm rmr rra rrb rrc rrg rrm rrr rru rua rub ruc rue rug rum rur ruu ua- uaa uab uac uae uag uam uar uau uba ubb ubc ube ubg ubr ubu uca ucb ucc uce ucg ucm ucr ucu uea ueb uec uee ueg uem uer uga ugb ugc uge ugg ugm ugr ugu um- uma umb umc ume umg umm umr umu ur- ura urb urc ure urg urm urr uru uua uuc uue uug uum uur uuu