-al a-a a-b a-c aaa aab aac aag aak aal aar aas ab- aba abb abc abg abk abl abr abs ac- aca acb acc acg ack acl acr acs ag- aga agb agc agg agk agl agr ags aka akb akc akg akk akl akr aks al- ala alb alc alg alk all alr als ar- ara arb arc arg ark arl arr ars as- asa asb asc asg ask asl asr ass baa bab bac bag bak bal bar bas bba bbb bbc bbg bbk bbl bbr bbs bca bcb bcc bcg bck bcl bcr bcs bga bgb bgc bgg bgk bgl bgr bgs bka bkb bkc bkg bkk bkl bkr bks bla blb blc blg blk bll blr bls bra brb brg brk brl brr brs bsa bsb bsc bsg bsk bsl bsr bss c-- caa cab cac cag cak cal car cas cba cbb cbc cbg cbk cbl cbr cbs cca ccb ccc ccg cck ccl ccr ccs cga cgb cgc cgg cgl cgr cgs cka ckb ckc cks cl- cla clb clc clg clk cll clr cls cra crb crc crg crk crl crr crs csa csb csc csg csk csl csr css gaa gab gac gag gak gal gar gas gba gbc gbg gbk gbl gbr gbs gca gcb gcc gcg gck gcl gcr gcs gga ggb ggc ggg ggr ggs gka gkb gks gla glb glc glg glk gll glr gls gra grb grc grg grk grl grr grs gsa gsb gsc gsg gsk gsl gsr gss ka- kaa kab kac kag kak kal kar kas kba kbb kbc kbk kbl kbr kbs kca kcb kcc kcg kck kcl kcr kcs kga kgb kgc kgl kgs kkb kkc kkk kkl kkr kks kl- kla klb klc klg klr kls kra krc krg krk krl krr krs ksa ksb ksc ksg ksk ksl ksr kss la- laa lab lac lag lak lal lar las lba lbb lbc lbg lbk lbl lbr lbs lca lcb lcc lcg lck lcl lcr lcs lga lgb lgc lgg lgk lgl lgr lgs lka lkb lkg lkl lkr lks lla llb llc llg llk lll llr lls lra lrb lrc lrg lrk lrr lrs lsa lsb lsc lsg lsk lsl lsr lss ra- raa rab rac rag rak ral rar ras rba rbb rbc rbg rbk rbl rbr rbs rca rcb rcc rcg rcl rcr rcs rga rgb rgc rgg rgk rgr rgs rkb rkc rkg rkk rks rla rlc rlg rll rlr rls rra rrb rrc rrg rrk rrl rrr rrs rsa rsb rsc rsg rsk rsl rsr rss saa sab sac sag sak sal sar sas sba sbb sbc sbg sbk sbl sbr sbs sca scb scc scg sck scl scr scs sga sgb sgc sgg sgk sgl sgr sgs sk- ska skb skc skg skk skl skr sks sla slb slc slg slk sll slr sls sr- sra srb src srg srk srl srr srs ss- ssa ssb ssc ssg ssk ssl ssr sss