-al a-a a-b a-c a-t aaa aab aac aak aal aar aas aat ab- aba abb abc abk abl abr abs abt ac- aca acb acc ack acl acr acs act aka akb akc akk akl akr aks al- ala alb alc alk all alr als alt ar- ara arb arc ark arl arr ars art as- asa asb asc ask asl asr ass ast at- ata atb atc atl atr ats att baa bab bac bak bal bar bas bat bba bbb bbc bbk bbl bbr bbs bbt bca bcb bcc bck bcl bcr bcs bct bka bkb bkc bkk bkl bkr bks bkt bla blb blc blk bll blr bls blt bra brb brk brl brr brs brt bsa bsb bsc bsk bsl bsr bss bst bta btb btc btk btl btr bts btt c-- caa cab cac cak cal car cas cat cba cbb cbc cbk cbl cbr cbs cbt cca ccb ccc cck ccl ccr ccs cct cka ckb ckc cks ckt cl- cla clb clc clk cll clr cls clt cra crb crc crk crl crr crs crt csa csb csc csk csl csr css cst cta ctb ctc ctk ctl ctr cts ctt k-t ka- kaa kab kac kak kal kar kas kat kba kbb kbc kbk kbl kbr kbs kca kcb kcc kck kcl kcr kcs kct kkb kkc kkk kkl kkr kks kkt kl- kla klb klc klr kls klt kra krc krk krl krr krs krt ksa ksb ksc ksk ksl ksr kss kst kta ktb ktc ktk ktl ktr kts ktt la- laa lab lac lak lal lar las lat lba lbb lbc lbk lbl lbr lbs lbt lca lcb lcc lck lcl lcr lcs lct lka lkb lkl lkr lks lkt lla llb llc llk lll llr lls llt lra lrb lrc lrk lrr lrs lrt lsa lsb lsc lsk lsl lsr lss lst lta ltb ltc ltk ltl ltr lts ltt ra- raa rab rac rak ral rar ras rat rba rbb rbc rbk rbl rbr rbs rbt rca rcb rcc rcl rcr rcs rct rkb rkc rkk rks rkt rla rlc rll rlr rls rlt rra rrb rrc rrk rrl rrr rrs rrt rsa rsb rsc rsk rsl rsr rss rst rta rtb rtc rtk rtl rtr rts rtt saa sab sac sak sal sar sas sat sba sbb sbc sbk sbl sbr sbs sbt sca scb scc sck scl scr scs sct sk- ska skb skc skk skl skr sks skt sla slb slc slk sll slr sls slt sr- sra srb src srk srl srr srs srt ss- ssa ssb ssc ssk ssl ssr sss sst sta stb stc stk stl str sts stt taa tab tac tak tal tar tas tat tba tbb tbc tbk tbl tbr tbs tbt tca tcb tcc tck tcl tcr tcs tct tka tkb tkc tkk tkl tkr tks tkt tla tlc tlk tll tlr tls tlt tra trb trc trk trl trr trs trt tsa tsb tsc tsk tsl tsr tss tst tta ttb ttc ttk ttl ttr tts ttt