-al a-a a-b a-c a-t aaa aab aac aak aal aas aat ab- aba abb abc abk abl abs abt ac- aca acb acc ack acl acs act aka akb akc akk akl aks al- ala alb alc alk all als alt as- asa asb asc ask asl ass ast at- ata atb atc atl ats att baa bab bac bak bal bas bat bba bbb bbc bbk bbl bbs bbt bca bcb bcc bck bcl bcs bct bka bkb bkc bkk bkl bks bkt bla blb blc blk bll bls blt bsa bsb bsc bsk bsl bss bst bta btb btc btk btl bts btt c-- caa cab cac cak cal cas cat cba cbb cbc cbk cbl cbs cbt cca ccb ccc cck ccl ccs cct cka ckb ckc cks ckt cl- cla clb clc clk cll cls clt csa csb csc csk csl css cst cta ctb ctc ctk ctl cts ctt k-t ka- kaa kab kac kak kal kas kat kba kbb kbc kbk kbl kbs kca kcb kcc kck kcl kcs kct kkb kkc kkk kkl kks kkt kl- kla klb klc kls klt ksa ksb ksc ksk ksl kss kst kta ktb ktc ktk ktl kts ktt la- laa lab lac lak lal las lat lba lbb lbc lbk lbl lbs lbt lca lcb lcc lck lcl lcs lct lka lkb lkl lks lkt lla llb llc llk lll lls llt lsa lsb lsc lsk lsl lss lst lta ltb ltc ltk ltl lts ltt saa sab sac sak sal sas sat sba sbb sbc sbk sbl sbs sbt sca scb scc sck scl scs sct sk- ska skb skc skk skl sks skt sla slb slc slk sll sls slt ss- ssa ssb ssc ssk ssl sss sst sta stb stc stk stl sts stt taa tab tac tak tal tas tat tba tbb tbc tbk tbl tbs tbt tca tcb tcc tck tcl tcs tct tka tkb tkc tkk tkl tks tkt tla tlc tlk tll tls tlt tsa tsb tsc tsk tsl tss tst tta ttb ttc ttk ttl tts ttt