-al a-a a-b a-c aaa aab aac aae aag aak aal aas ab- aba abb abc abe abg abk abl abs ac- aca acb acc ace acg ack acl acs aea aeb aec aee aeg aek ael aes ag- aga agb agc age agg agk agl ags aka akb akc ake akg akk akl aks al- ala alb alc ale alg alk all als as- asa asb asc ase asg ask asl ass baa bab bac bae bag bak bal bas bba bbb bbc bbe bbg bbk bbl bbs bca bcb bcc bce bcg bck bcl bcs be- bea beb bec bee beg bek bel bes bga bgb bgc bge bgg bgk bgl bgs bka bkb bkc bke bkg bkk bkl bks bla blb blc ble blg blk bll bls bsa bsb bsc bse bsg bsk bsl bss c-- caa cab cac cae cag cak cal cas cba cbb cbc cbe cbg cbk cbl cbs cca ccb ccc cce ccg cck ccl ccs ce- cea ceb cec cee ceg cek cel ces cga cgb cgc cge cgg cgl cgs cka ckb ckc cks cl- cla clb clc cle clg clk cll cls csa csb csc cse csg csk csl css eaa eab eac eae eag eak eal eas eba ebb ebc ebe ebg ebk ebl ebs ec- eca ecb ecc ece ecg eck ecl ecs eea eeb eec eee eeg eek eel ees ega egb egc ege egg egl egs eka ekb ekc eke ekg ekl eks ela elb elc ele elg elk ell els es- esa esb esc ese esg esk esl ess gaa gab gac gae gag gak gal gas gba gbc gbe gbg gbk gbl gbs gca gcb gcc gce gcg gck gcl gcs ge- gea geb gec gee geg gek gel ges gga ggb ggc ggg ggs gka gkb gks gla glb glc gle glg glk gll gls gsa gsb gsc gse gsg gsk gsl gss ka- kaa kab kac kae kag kak kal kas kba kbb kbc kbe kbk kbl kbs kca kcb kcc kce kcg kck kcl kcs ke- kea keb kec kee keg kek kel kes kga kgb kgc kgl kgs kkb kkc kke kkk kkl kks kl- kla klb klc klg kls ksa ksb ksc kse ksg ksk ksl kss la- laa lab lac lae lag lak lal las lba lbb lbc lbe lbg lbk lbl lbs lca lcb lcc lce lcg lck lcl lcs lea leb lec lee leg lek lel les lga lgb lgc lge lgg lgk lgl lgs lka lkb lkg lkl lks lla llb llc lle llg llk lll lls lsa lsb lsc lse lsg lsk lsl lss saa sab sac sae sag sak sal sas sba sbb sbc sbe sbg sbk sbl sbs sca scb scc sce scg sck scl scs se- sea seb sec see seg sek sel ses sga sgb sgc sge sgg sgk sgl sgs sk- ska skb skc ske skg skk skl sks sla slb slc sle slg slk sll sls ss- ssa ssb ssc sse ssg ssk ssl sss