-al -er a-a a-b a-c a-t aaa aab aac aae aag aal aan aar aat ab- aba abb abc abe abg abl abn abr abt ac- aca acb acc ace acg acl acn acr act aea aeb aec aee aeg ael aen aer aet ag- aga agb agc age agg agl agn agr agt al- ala alb alc ale alg all aln alr alt an- ana anb anc ane ang anl ann anr ant ar- ara arb arc are arg arl arn arr art at- ata atb atc ate atg atl atn atr att baa bab bac bae bag bal ban bar bat bba bbb bbc bbe bbg bbl bbn bbr bbt bca bcb bcc bce bcg bcl bcn bcr bct be- bea beb bec bee beg bel ben ber bet bga bgb bgc bge bgg bgl bgn bgr bgt bla blb blc ble blg bll bln blr blt bna bnb bnc bne bng bnl bnn bnr bnt bra brb bre brg brl brn brr brt bta btb btc bte btg btl btn btr btt c-- caa cab cac cae cag cal can car cat cba cbb cbc cbe cbg cbl cbn cbr cbt cca ccb ccc cce ccg ccl ccn ccr cct ce- cea ceb cec cee ceg cel cen cer cet cga cgb cgc cge cgg cgl cgn cgr cgt cl- cla clb clc cle clg cll cln clr clt cn- cna cnb cnc cne cng cnl cnn cnr cnt cra crb crc cre crg crl crn crr crt cta ctb ctc cte ctg ctl ctn ctr ctt eaa eab eac eae eag eal ean ear eat eba ebb ebc ebe ebg ebl ebn ebr ebt ec- eca ecb ecc ece ecg ecl ecn ecr ect eea eeb eec eee eeg eel een eer eet ega egb egc ege egg egl egn egr egt ela elb elc ele elg ell eln elr elt en- ena enb enc ene eng enl enn enr ent era erb erc ere erg erl ern err ert eta etb etc ete etg etl etn etr ett gaa gab gac gae gag gal gan gar gat gba gbc gbe gbg gbl gbn gbr gbt gca gcb gcc gce gcg gcl gcn gcr gct ge- gea geb gec gee geg gel gen ger get gga ggb ggc ggg ggn ggr ggt gla glb glc gle glg gll gln glr glt gna gnb gnc gne gnl gnn gnr gnt gra grb grc gre grg grl grn grr grt gta gtb gtc gte gtg gtl gtn gtr gtt la- laa lab lac lae lag lal lan lar lat lba lbb lbc lbe lbg lbl lbr lbt lca lcb lcc lce lcg lcl lcn lcr lct lea leb lec lee leg lel len ler let lga lgb lgc lge lgg lgl lgn lgr lgt lla llb llc lle llg lll lln llr llt lna lnb lnc lne lng lnl lnn lnr lnt lra lrb lrc lrg lrn lrr lrt lta ltb ltc lte ltg ltl ltr ltt naa nab nac nae nag nal nan nar nat nba nbb nbc nbe nbg nbl nbn nbr nbt nca ncb ncc nce ncg ncl ncn ncr nct ne- nea neb nec nee neg nel nen ner net nga ngb ngc nge ngg ngl ngn ngt nla nlb nlc nle nlg nll nln nlr nlt nna nnb nnc nne nng nnl nnn nnt nra nrb nrc nre nrg nrl nrn nrr nrt nta ntb ntc nte ntg ntn ntr ntt ra- raa rab rac rae rag ral ran rar rat rba rbb rbc rbe rbg rbl rbn rbr rbt rca rcb rcc rce rcg rcl rcn rcr rct re- rea reb rec ree reg rel ren rer ret rga rgb rgc rge rgg rgn rgr rgt rla rlc rle rlg rll rln rlr rlt rna rnb rnc rng rnn rnr rnt rra rrb rrc rrg rrl rrn rrr rrt rta rtb rtc rte rtg rtl rtn rtr rtt taa tab tac tae tag tal tan tar tat tba tbb tbc tbe tbg tbl tbn tbr tbt tca tcb tcc tce tcg tcl tcn tcr tct te- tea teb tec tee teg tel ten ter tet tga tgb tgc tge tgg tgl tgn tgr tgt tla tlc tle tlg tll tln tlr tlt tna tnb tnc tne tng tnl tnn tnr tnt tra trb trc tre trg trl trn trr trt tta ttb ttc tte ttg ttl ttn ttr ttt