-al a-a a-b a-c a-t aaa aab aac aae aak aal aan aas aat ab- aba abb abc abe abk abl abn abs abt ac- aca acb acc ace ack acl acn acs act aea aeb aec aee aek ael aen aes aet aka akb akc ake akk akl akn aks al- ala alb alc ale alk all aln als alt an- ana anb anc ane ank anl ann ans ant as- asa asb asc ase ask asl asn ass ast at- ata atb atc ate atl atn ats att baa bab bac bae bak bal ban bas bat bba bbb bbc bbe bbk bbl bbn bbs bbt bca bcb bcc bce bck bcl bcn bcs bct be- bea beb bec bee bek bel ben bes bet bka bkb bkc bke bkk bkl bkn bks bkt bla blb blc ble blk bll bln bls blt bna bnb bnc bne bnk bnl bnn bns bnt bsa bsb bsc bse bsk bsl bsn bss bst bta btb btc bte btk btl btn bts btt c-- caa cab cac cae cak cal can cas cat cba cbb cbc cbe cbk cbl cbn cbs cbt cca ccb ccc cce cck ccl ccn ccs cct ce- cea ceb cec cee cek cel cen ces cet cka ckb ckc cks ckt cl- cla clb clc cle clk cll cln cls clt cn- cna cnb cnc cne cnl cnn cns cnt csa csb csc cse csk csl csn css cst cta ctb ctc cte ctk ctl ctn cts ctt eaa eab eac eae eak eal ean eas eat eba ebb ebc ebe ebk ebl ebn ebs ebt ec- eca ecb ecc ece eck ecl ecn ecs ect eea eeb eec eee eek eel een ees eet eka ekb ekc eke ekl eks ekt ela elb elc ele elk ell eln els elt en- ena enb enc ene enk enl enn ens ent es- esa esb esc ese esk esl esn ess est eta etb etc ete etk etl etn ets ett k-t ka- kaa kab kac kae kak kal kan kas kat kba kbb kbc kbe kbk kbl kbn kbs kca kcb kcc kce kck kcl kcn kcs kct ke- kea keb kec kee kek kel ken kes ket kkb kkc kke kkk kkl kkn kks kkt kl- kla klb klc kls klt kn- kna knc kne knk knl knn knt ksa ksb ksc kse ksk ksl ksn kss kst kta ktb ktc kte ktk ktl ktn kts ktt la- laa lab lac lae lak lal lan las lat lba lbb lbc lbe lbk lbl lbs lbt lca lcb lcc lce lck lcl lcn lcs lct lea leb lec lee lek lel len les let lka lkb lkl lks lkt lla llb llc lle llk lll lln lls llt lna lnb lnc lne lnk lnl lnn lns lnt lsa lsb lsc lse lsk lsl lsn lss lst lta ltb ltc lte ltk ltl lts ltt naa nab nac nae nak nal nan nas nat nba nbb nbc nbe nbk nbl nbn nbs nbt nca ncb ncc nce nck ncl ncn ncs nct ne- nea neb nec nee nek nel nen nes net nka nkc nke nkk nkn nks nkt nla nlb nlc nle nlk nll nln nls nlt nna nnb nnc nne nnk nnl nnn nns nnt nsa nsb nsc nse nsk nsl nsn nss nst nta ntb ntc nte ntk ntn nts ntt saa sab sac sae sak sal san sas sat sba sbb sbc sbe sbk sbl sbn sbs sbt sca scb scc sce sck scl scn scs sct se- sea seb sec see sek sel sen ses set sk- ska skb skc ske skk skl sks skt sla slb slc sle slk sll sln sls slt sna snb snc sne snk snl snn sns snt ss- ssa ssb ssc sse ssk ssl ssn sss sst sta stb stc ste stk stl stn sts stt taa tab tac tae tak tal tan tas tat tba tbb tbc tbe tbk tbl tbn tbs tbt tca tcb tcc tce tck tcl tcn tcs tct te- tea teb tec tee tek tel ten tes tet tka tkb tkc tke tkk tkl tks tkt tla tlc tle tlk tll tln tls tlt tna tnb tnc tne tnk tnl tnn tns tnt tsa tsb tsc tse tsk tsl tsn tss tst tta ttb ttc tte ttk ttl ttn tts ttt