-al -er a-a a-b a-c a-t aaa aab aac aae aak aal aar aas aat ab- aba abb abc abe abk abl abr abs abt ac- aca acb acc ace ack acl acr acs act aea aeb aec aee aek ael aer aes aet aka akb akc ake akk akl akr aks al- ala alb alc ale alk all alr als alt ar- ara arb arc are ark arl arr ars art as- asa asb asc ase ask asl asr ass ast at- ata atb atc ate atl atr ats att baa bab bac bae bak bal bar bas bat bba bbb bbc bbe bbk bbl bbr bbs bbt bca bcb bcc bce bck bcl bcr bcs bct be- bea beb bec bee bek bel ber bes bet bka bkb bkc bke bkk bkl bkr bks bkt bla blb blc ble blk bll blr bls blt bra brb bre brk brl brr brs brt bsa bsb bsc bse bsk bsl bsr bss bst bta btb btc bte btk btl btr bts btt c-- caa cab cac cae cak cal car cas cat cba cbb cbc cbe cbk cbl cbr cbs cbt cca ccb ccc cce cck ccl ccr ccs cct ce- cea ceb cec cee cek cel cer ces cet cka ckb ckc cks ckt cl- cla clb clc cle clk cll clr cls clt cra crb crc cre crk crl crr crs crt csa csb csc cse csk csl csr css cst cta ctb ctc cte ctk ctl ctr cts ctt eaa eab eac eae eak eal ear eas eat eba ebb ebc ebe ebk ebl ebr ebs ebt ec- eca ecb ecc ece eck ecl ecr ecs ect eea eeb eec eee eek eel eer ees eet eka ekb ekc eke ekl ekr eks ekt ela elb elc ele elk ell elr els elt era erb erc ere erk erl err ers ert es- esa esb esc ese esk esl esr ess est eta etb etc ete etk etl etr ets ett k-t ka- kaa kab kac kae kak kal kar kas kat kba kbb kbc kbe kbk kbl kbr kbs kca kcb kcc kce kck kcl kcr kcs kct ke- kea keb kec kee kek kel ker kes ket kkb kkc kke kkk kkl kkr kks kkt kl- kla klb klc klr kls klt kra krc krk krl krr krs krt ksa ksb ksc kse ksk ksl ksr kss kst kta ktb ktc kte ktk ktl ktr kts ktt la- laa lab lac lae lak lal lar las lat lba lbb lbc lbe lbk lbl lbr lbs lbt lca lcb lcc lce lck lcl lcr lcs lct lea leb lec lee lek lel ler les let lka lkb lkl lkr lks lkt lla llb llc lle llk lll llr lls llt lra lrb lrc lrk lrr lrs lrt lsa lsb lsc lse lsk lsl lsr lss lst lta ltb ltc lte ltk ltl ltr lts ltt ra- raa rab rac rae rak ral rar ras rat rba rbb rbc rbe rbk rbl rbr rbs rbt rca rcb rcc rce rcl rcr rcs rct re- rea reb rec ree rek rel rer res ret rkb rkc rke rkk rks rkt rla rlc rle rll rlr rls rlt rra rrb rrc rrk rrl rrr rrs rrt rsa rsb rsc rse rsk rsl rsr rss rst rta rtb rtc rte rtk rtl rtr rts rtt saa sab sac sae sak sal sar sas sat sba sbb sbc sbe sbk sbl sbr sbs sbt sca scb scc sce sck scl scr scs sct se- sea seb sec see sek sel ser ses set sk- ska skb skc ske skk skl skr sks skt sla slb slc sle slk sll slr sls slt sr- sra srb src sre srk srl srr srs srt ss- ssa ssb ssc sse ssk ssl ssr sss sst sta stb stc ste stk stl str sts stt taa tab tac tae tak tal tar tas tat tba tbb tbc tbe tbk tbl tbr tbs tbt tca tcb tcc tce tck tcl tcr tcs tct te- tea teb tec tee tek tel ter tes tet tka tkb tkc tke tkk tkl tkr tks tkt tla tlc tle tlk tll tlr tls tlt tra trb trc tre trk trl trr trs trt tsa tsb tsc tse tsk tsl tsr tss tst tta ttb ttc tte ttk ttl ttr tts ttt