a-a a-b a-c aaa aab aac aae aag aak aam aas ab- aba abb abc abe abg abk abm abs ac- aca acb acc ace acg ack acm acs aea aeb aec aee aeg aek aem aes ag- aga agb agc age agg agk agm ags aka akb akc ake akg akk akm aks ama amb amc ame amg amk amm ams as- asa asb asc ase asg ask asm ass baa bab bac bae bag bak bam bas bba bbb bbc bbe bbg bbk bbm bbs bca bcb bcc bce bcg bck bcm bcs be- bea beb bec bee beg bek bem bes bga bgb bgc bge bgg bgk bgm bgs bka bkb bkc bke bkg bkk bkm bks bma bmb bmc bme bmg bmk bmm bms bsa bsb bsc bse bsg bsk bsm bss c-- caa cab cac cae cag cak cam cas cba cbb cbc cbe cbg cbk cbm cbs cca ccb ccc cce ccg cck ccm ccs ce- cea ceb cec cee ceg cek cem ces cga cgb cgc cge cgg cgm cgs cka ckb ckc ckm cks cma cmb cmc cme cmg cmk cmm cms csa csb csc cse csg csk csm css eaa eab eac eae eag eak eam eas eba ebb ebc ebe ebg ebk ebm ebs ec- eca ecb ecc ece ecg eck ecm ecs eea eeb eec eee eeg eek eem ees ega egb egc ege egg egm egs eka ekb ekc eke ekg eks em- ema emb emc eme emg emk emm ems es- esa esb esc ese esg esk esm ess gaa gab gac gae gag gak gam gas gba gbc gbe gbg gbk gbm gbs gca gcb gcc gce gcg gck gcm gcs ge- gea geb gec gee geg gek gem ges gga ggb ggc ggg ggm ggs gka gkb gkm gks gma gmb gmc gme gmg gmm gms gsa gsb gsc gse gsg gsk gsm gss ka- kaa kab kac kae kag kak kam kas kba kbb kbc kbe kbk kbm kbs kca kcb kcc kce kcg kck kcm kcs ke- kea keb kec kee keg kek kem kes kga kgb kgc kgm kgs kkb kkc kke kkk kkm kks kma kmb kmc kme kmg kmk kmm kms ksa ksb ksc kse ksg ksk ksm kss maa mab mac mae mag mak mam mas mba mbb mbc mbe mbg mbk mbm mbs mc- mca mcb mcc mce mcg mck mcm mcs mea meb mec mee meg mek mem mes mga mgb mgc mge mgk mgm mgs mka mkb mkc mke mkg mkk mkm mks mma mmb mmc mme mmg mmk mmm mms msa msb msc mse msg msk msm mss saa sab sac sae sag sak sam sas sba sbb sbc sbe sbg sbk sbm sbs sca scb scc sce scg sck scm scs se- sea seb sec see seg sek sem ses sga sgb sgc sge sgg sgk sgm sgs sk- ska skb skc ske skg skk skm sks sma smb smc sme smg smk smm sms ss- ssa ssb ssc sse ssg ssk ssm sss