-er a-a a-b a-c aaa aab aac aae aag aam aar aas ab- aba abb abc abe abg abm abr abs ac- aca acb acc ace acg acm acr acs aea aeb aec aee aeg aem aer aes ag- aga agb agc age agg agm agr ags ama amb amc ame amg amm amr ams ar- ara arb arc are arg arm arr ars as- asa asb asc ase asg asm asr ass baa bab bac bae bag bam bar bas bba bbb bbc bbe bbg bbm bbr bbs bca bcb bcc bce bcg bcm bcr bcs be- bea beb bec bee beg bem ber bes bga bgb bgc bge bgg bgm bgr bgs bma bmb bmc bme bmg bmm bmr bms bra brb bre brg brm brr brs bsa bsb bsc bse bsg bsm bsr bss c-- caa cab cac cae cag cam car cas cba cbb cbc cbe cbg cbm cbr cbs cca ccb ccc cce ccg ccm ccr ccs ce- cea ceb cec cee ceg cem cer ces cga cgb cgc cge cgg cgm cgr cgs cma cmb cmc cme cmg cmm cmr cms cra crb crc cre crg crm crr crs csa csb csc cse csg csm csr css eaa eab eac eae eag eam ear eas eba ebb ebc ebe ebg ebm ebr ebs ec- eca ecb ecc ece ecg ecm ecr ecs eea eeb eec eee eeg eem eer ees ega egb egc ege egg egm egr egs em- ema emb emc eme emg emm emr ems era erb erc ere erg erm err ers es- esa esb esc ese esg esm esr ess gaa gab gac gae gag gam gar gas gba gbc gbe gbg gbm gbr gbs gca gcb gcc gce gcg gcm gcr gcs ge- gea geb gec gee geg gem ger ges gga ggb ggc ggg ggm ggr ggs gma gmb gmc gme gmg gmm gmr gms gra grb grc gre grg grm grr grs gsa gsb gsc gse gsg gsm gsr gss m-r maa mab mac mae mag mam mar mas mba mbb mbc mbe mbg mbm mbr mbs mc- mca mcb mcc mce mcg mcm mcr mcs mea meb mec mee meg mem mer mes mga mgb mgc mge mgm mgr mgs mma mmb mmc mme mmg mmm mmr mms mra mrb mrc mre mrg mrm mrr mrs msa msb msc mse msg msm msr mss ra- raa rab rac rae rag ram rar ras rba rbb rbc rbe rbg rbm rbr rbs rca rcb rcc rce rcg rcm rcr rcs re- rea reb rec ree reg rem rer res rga rgb rgc rge rgg rgr rgs rma rmb rmc rme rmg rmm rmr rms rra rrb rrc rrg rrm rrr rrs rsa rsb rsc rse rsg rsm rsr rss saa sab sac sae sag sam sar sas sba sbb sbc sbe sbg sbm sbr sbs sca scb scc sce scg scm scr scs se- sea seb sec see seg sem ser ses sga sgb sgc sge sgg sgm sgr sgs sma smb smc sme smg smm smr sms sr- sra srb src sre srg srm srr srs ss- ssa ssb ssc sse ssg ssm ssr sss