-al a-a a-b a-t aaa aab aae aak aal aas aat aax ab- aba abb abe abk abl abs abt abx aea aeb aee aek ael aes aet aex aka akb ake akk akl aks al- ala alb ale alk all als alt alx as- asa asb ase ask asl ass ast asx at- ata atb ate atl ats att atx ax- axa axe axk axl axs axt axx baa bab bae bak bal bas bat bax bba bbb bbe bbk bbl bbs bbt bbx be- bea beb bee bek bel bes bet bex bka bkb bke bkk bkl bks bkt bkx bla blb ble blk bll bls blt blx bsa bsb bse bsk bsl bss bst bsx bta btb bte btk btl bts btt btx bxb bxl bxx eaa eab eae eak eal eas eat eax eba ebb ebe ebk ebl ebs ebt ebx eea eeb eee eek eel ees eet eex eka ekb eke ekl eks ekt ela elb ele elk ell els elt elx es- esa esb ese esk esl ess est esx eta etb ete etk etl ets ett etx ex- exa exe exl exs ext exx k-t ka- kaa kab kae kak kal kas kat kax kba kbb kbe kbk kbl kbs kbx ke- kea keb kee kek kel kes ket kex kkb kke kkk kkl kks kkt kl- kla klb kls klt klx ksa ksb kse ksk ksl kss kst kta ktb kte ktk ktl kts ktt kxl la- laa lab lae lak lal las lat lax lba lbb lbe lbk lbl lbs lbt lbx lea leb lee lek lel les let lex lka lkb lkl lks lkt lla llb lle llk lll lls llt lsa lsb lse lsk lsl lss lst lta ltb lte ltk ltl lts ltt ltx lxx saa sab sae sak sal sas sat sax sba sbb sbe sbk sbl sbs sbt sbx se- sea seb see sek sel ses set sex sk- ska skb ske skk skl sks skt skx sla slb sle slk sll sls slt slx ss- ssa ssb sse ssk ssl sss sst ssx sta stb ste stk stl sts stt stx sxl sxs sxt t-x taa tab tae tak tal tas tat tax tba tbb tbe tbk tbl tbs tbt te- tea teb tee tek tel tes tet tex tka tkb tke tkk tkl tks tkt tla tle tlk tll tls tlt tlx tsa tsb tse tsk tsl tss tst tsx tta ttb tte ttk ttl tts ttt ttx txe txk txl txs txt xaa xak xal xas xat xbe xbl xbx xee xel xes xet xex xkb xke xkl xks xla xlb xls xlt xsa xsb xsl xss xst xts xtx xxl xxx