-al a-a a-b a-c a-t aaa aab aac aae aak aal aas aat ab- aba abb abc abe abk abl abs abt ac- aca acb acc ace ack acl acs act aea aeb aec aee aek ael aes aet aka akb akc ake akk akl aks al- ala alb alc ale alk all als alt as- asa asb asc ase ask asl ass ast at- ata atb atc ate atl ats att baa bab bac bae bak bal bas bat bba bbb bbc bbe bbk bbl bbs bbt bca bcb bcc bce bck bcl bcs bct be- bea beb bec bee bek bel bes bet bka bkb bkc bke bkk bkl bks bkt bla blb blc ble blk bll bls blt bsa bsb bsc bse bsk bsl bss bst bta btb btc bte btk btl bts btt c-- caa cab cac cae cak cal cas cat cba cbb cbc cbe cbk cbl cbs cbt cca ccb ccc cce cck ccl ccs cct ce- cea ceb cec cee cek cel ces cet cka ckb ckc cks ckt cl- cla clb clc cle clk cll cls clt csa csb csc cse csk csl css cst cta ctb ctc cte ctk ctl cts ctt eaa eab eac eae eak eal eas eat eba ebb ebc ebe ebk ebl ebs ebt ec- eca ecb ecc ece eck ecl ecs ect eea eeb eec eee eek eel ees eet eka ekb ekc eke ekl eks ekt ela elb elc ele elk ell els elt es- esa esb esc ese esk esl ess est eta etb etc ete etk etl ets ett k-t ka- kaa kab kac kae kak kal kas kat kba kbb kbc kbe kbk kbl kbs kca kcb kcc kce kck kcl kcs kct ke- kea keb kec kee kek kel kes ket kkb kkc kke kkk kkl kks kkt kl- kla klb klc kls klt ksa ksb ksc kse ksk ksl kss kst kta ktb ktc kte ktk ktl kts ktt la- laa lab lac lae lak lal las lat lba lbb lbc lbe lbk lbl lbs lbt lca lcb lcc lce lck lcl lcs lct lea leb lec lee lek lel les let lka lkb lkl lks lkt lla llb llc lle llk lll lls llt lsa lsb lsc lse lsk lsl lss lst lta ltb ltc lte ltk ltl lts ltt saa sab sac sae sak sal sas sat sba sbb sbc sbe sbk sbl sbs sbt sca scb scc sce sck scl scs sct se- sea seb sec see sek sel ses set sk- ska skb skc ske skk skl sks skt sla slb slc sle slk sll sls slt ss- ssa ssb ssc sse ssk ssl sss sst sta stb stc ste stk stl sts stt taa tab tac tae tak tal tas tat tba tbb tbc tbe tbk tbl tbs tbt tca tcb tcc tce tck tcl tcs tct te- tea teb tec tee tek tel tes tet tka tkb tkc tke tkk tkl tks tkt tla tlc tle tlk tll tls tlt tsa tsb tsc tse tsk tsl tss tst tta ttb ttc tte ttk ttl tts ttt