-al -er a-a a-b a-c a-t aaa aab aac aae aag aal aan aar aas aat ab- aba abb abc abe abg abl abn abr abs abt ac- aca acb acc ace acg acl acn acr acs act aea aeb aec aee aeg ael aen aer aes aet ag- aga agb agc age agg agl agn agr ags agt al- ala alb alc ale alg all aln alr als alt an- ana anb anc ane ang anl ann anr ans ant ar- ara arb arc are arg arl arn arr ars art as- asa asb asc ase asg asl asn asr ass ast at- ata atb atc ate atg atl atn atr ats att baa bab bac bae bag bal ban bar bas bat bba bbb bbc bbe bbg bbl bbn bbr bbs bbt bca bcb bcc bce bcg bcl bcn bcr bcs bct be- bea beb bec bee beg bel ben ber bes bet bga bgb bgc bge bgg bgl bgn bgr bgs bgt bla blb blc ble blg bll bln blr bls blt bna bnb bnc bne bng bnl bnn bnr bns bnt bra brb bre brg brl brn brr brs brt bsa bsb bsc bse bsg bsl bsn bsr bss bst bta btb btc bte btg btl btn btr bts btt c-- caa cab cac cae cag cal can car cas cat cba cbb cbc cbe cbg cbl cbn cbr cbs cbt cca ccb ccc cce ccg ccl ccn ccr ccs cct ce- cea ceb cec cee ceg cel cen cer ces cet cga cgb cgc cge cgg cgl cgn cgr cgs cgt cl- cla clb clc cle clg cll cln clr cls clt cn- cna cnb cnc cne cng cnl cnn cnr cns cnt cra crb crc cre crg crl crn crr crs crt csa csb csc cse csg csl csn csr css cst cta ctb ctc cte ctg ctl ctn ctr cts ctt eaa eab eac eae eag eal ean ear eas eat eba ebb ebc ebe ebg ebl ebn ebr ebs ebt ec- eca ecb ecc ece ecg ecl ecn ecr ecs ect eea eeb eec eee eeg eel een eer ees eet ega egb egc ege egg egl egn egr egs egt ela elb elc ele elg ell eln elr els elt en- ena enb enc ene eng enl enn enr ens ent era erb erc ere erg erl ern err ers ert es- esa esb esc ese esg esl esn esr ess est eta etb etc ete etg etl etn etr ets ett gaa gab gac gae gag gal gan gar gas gat gba gbc gbe gbg gbl gbn gbr gbs gbt gca gcb gcc gce gcg gcl gcn gcr gcs gct ge- gea geb gec gee geg gel gen ger ges get gga ggb ggc ggg ggn ggr ggs ggt gla glb glc gle glg gll gln glr gls glt gna gnb gnc gne gnl gnn gnr gns gnt gra grb grc gre grg grl grn grr grs grt gsa gsb gsc gse gsg gsl gsn gsr gss gst gta gtb gtc gte gtg gtl gtn gtr gts gtt la- laa lab lac lae lag lal lan lar las lat lba lbb lbc lbe lbg lbl lbr lbs lbt lca lcb lcc lce lcg lcl lcn lcr lcs lct lea leb lec lee leg lel len ler les let lga lgb lgc lge lgg lgl lgn lgr lgs lgt lla llb llc lle llg lll lln llr lls llt lna lnb lnc lne lng lnl lnn lnr lns lnt lra lrb lrc lrg lrn lrr lrs lrt lsa lsb lsc lse lsg lsl lsn lsr lss lst lta ltb ltc lte ltg ltl ltr lts ltt naa nab nac nae nag nal nan nar nas nat nba nbb nbc nbe nbg nbl nbn nbr nbs nbt nca ncb ncc nce ncg ncl ncn ncr ncs nct ne- nea neb nec nee neg nel nen ner nes net nga ngb ngc nge ngg ngl ngn ngs ngt nla nlb nlc nle nlg nll nln nlr nls nlt nna nnb nnc nne nng nnl nnn nns nnt nra nrb nrc nre nrg nrl nrn nrr nrs nrt nsa nsb nsc nse nsg nsl nsn nsr nss nst nta ntb ntc nte ntg ntn ntr nts ntt ra- raa rab rac rae rag ral ran rar ras rat rba rbb rbc rbe rbg rbl rbn rbr rbs rbt rca rcb rcc rce rcg rcl rcn rcr rcs rct re- rea reb rec ree reg rel ren rer res ret rga rgb rgc rge rgg rgn rgr rgs rgt rla rlc rle rlg rll rln rlr rls rlt rna rnb rnc rng rnn rnr rns rnt rra rrb rrc rrg rrl rrn rrr rrs rrt rsa rsb rsc rse rsg rsl rsn rsr rss rst rta rtb rtc rte rtg rtl rtn rtr rts rtt saa sab sac sae sag sal san sar sas sat sba sbb sbc sbe sbg sbl sbn sbr sbs sbt sca scb scc sce scg scl scn scr scs sct se- sea seb sec see seg sel sen ser ses set sga sgb sgc sge sgg sgl sgn sgr sgs sgt sla slb slc sle slg sll sln slr sls slt sna snb snc sne sng snl snn snr sns snt sr- sra srb src sre srg srl srn srr srs srt ss- ssa ssb ssc sse ssg ssl ssn ssr sss sst sta stb stc ste stg stl stn str sts stt taa tab tac tae tag tal tan tar tas tat tba tbb tbc tbe tbg tbl tbn tbr tbs tbt tca tcb tcc tce tcg tcl tcn tcr tcs tct te- tea teb tec tee teg tel ten ter tes tet tga tgb tgc tge tgg tgl tgn tgr tgs tgt tla tlc tle tlg tll tln tlr tls tlt tna tnb tnc tne tng tnl tnn tnr tns tnt tra trb trc tre trg trl trn trr trs trt tsa tsb tsc tse tsg tsl tsn