-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aan aar aas aat ab- aba abb abc abe abg abi abn abr abs abt ac- aca acb acc ace acg aci acn acr acs act aea aeb aec aee aeg aei aen aer aes aet ag- aga agb agc age agg agi agn agr ags agt ai- aia aib aic aie aig aii ain air ais ait an- ana anb anc ane ang ani ann anr ans ant ar- ara arb arc are arg ari arn arr ars art as- asa asb asc ase asg asi asn asr ass ast at- ata atb atc ate atg ati atn atr ats att baa bab bac bae bag bai ban bar bas bat bba bbb bbc bbe bbg bbi bbn bbr bbs bbt bca bcb bcc bce bcg bci bcn bcr bcs bct be- bea beb bec bee beg bei ben ber bes bet bga bgb bgc bge bgg bgi bgn bgr bgs bgt bi- bia bib bic bie big bii bin bir bis bit bna bnb bnc bne bng bni bnn bnr bns bnt bra brb bre brg bri brn brr brs brt bsa bsb bsc bse bsg bsi bsn bsr bss bst bta btb btc bte btg bti btn btr bts btt c-- caa cab cac cae cag cai can car cas cat cba cbb cbc cbe cbg cbi cbn cbr cbs cbt cca ccb ccc cce ccg cci ccn ccr ccs cct ce- cea ceb cec cee ceg cei cen cer ces cet cga cgb cgc cge cgg cgi cgn cgr cgs cgt ci- cia cib cic cie cig cii cin cir cis cit cn- cna cnb cnc cne cng cni cnn cnr cns cnt cra crb crc cre crg cri crn crr crs crt csa csb csc cse csg csi csn csr css cst cta ctb ctc cte ctg cti ctn ctr cts ctt eaa eab eac eae eag eai ean ear eas eat eba ebb ebc ebe ebg ebi ebn ebr ebs ebt ec- eca ecb ecc ece ecg eci ecn ecr ecs ect eea eeb eec eee eeg een eer ees eet ega egb egc ege egg egi egn egr egs egt eia eib eic eie eig eii ein eir eis eit en- ena enb enc ene eng eni enn enr ens ent era erb erc ere erg eri ern err ers ert es- esa esb esc ese esg esi esn esr ess est eta etb etc ete etg eti etn etr ets ett gaa gab gac gae gag gai gan gar gas gat gba gbc gbe gbg gbi gbn gbr gbs gbt gca gcb gcc gce gcg gci gcn gcr gcs gct ge- gea geb gec gee geg gei gen ger ges get gga ggb ggc ggg ggi ggn ggr ggs ggt gia gib gic gie gig gii gin gir gis git gna gnb gnc gne gni gnn gnr gns gnt gra grb grc gre grg gri grn grr grs grt gsa gsb gsc gse gsg gsi gsn gsr gss gst gta gtb gtc gte gtg gti gtn gtr gts gtt ia- iaa iab iac iae iag iai ian iar ias iat iba ibb ibc ibe ibg ibi ibn ibr ibs ibt ica icb icc ice icg ici icn icr ics ict ie- iea iec iee ieg iei ien ier ies iet iga igb igc ige igg igi ign igr igs igt iia iib iic iie iii iin iir iis iit in- ina inb inc ine ing ini inn inr ins int ir- ira irb irc ire irg iri irn irr irs irt is- isa isb isc ise isg isi isn isr iss ist ita itb itc ite itg iti itn its itt n-i naa nab nac nae nag nai nan nar nas nat nba nbb nbc nbe nbg nbi nbn nbr nbs nbt nca ncb ncc nce ncg nci ncn ncr ncs nct ne- nea neb nec nee neg nei nen ner nes net nga ngb ngc nge ngg ngi ngn ngs ngt nia nib nic nie nig nii nin nir nis nit nna nnb nnc nne nng nni nnn nns nnt nra nrb nrc nre nrg nri nrn nrr nrs nrt nsa nsb nsc nse nsg nsi nsn nsr nss nst nta ntb ntc nte ntg nti ntn ntr nts ntt ra- raa rab rac rae rag rai ran rar ras rat rba rbb rbc rbe rbg rbi rbn rbr rbs rbt rca rcb rcc rce rcg rci rcn rcr rcs rct re- rea reb rec ree reg rei ren rer res ret rga rgb rgc rge rgg rgi rgn rgr rgs rgt ria rib ric rie rig rii rin rir ris rit rna rnb rnc rng rni rnn rnr rns rnt rra rrb rrc rrg rri rrn rrr rrs rrt rsa rsb rsc rse rsg rsi rsn rsr rss rst rta rtb rtc rte rtg rti rtn rtr rts rtt saa sab sac sae sag sai san sar sas sat sba sbb sbc sbe sbg sbi sbn sbr sbs sbt sca scb scc sce scg sci scn scr scs sct se- sea seb sec see seg sei sen ser ses set sga sgb sgc sge sgg sgi sgn sgr sgs sgt sia sib sic sie sig sii sin sir sis sit sna snb snc sne sng sni snn snr sns snt sr- sra srb src sre srg sri srn srr srs srt ss- ssa ssb ssc sse ssg ssi ssn ssr sss sst sta stb stc ste stg sti stn str sts stt taa tab tac tae tag tai tan tar tas tat tba tbb tbc tbe tbg tbi tbn tbr tbs tbt tca tcb tcc tce tcg tci tcn tcr tcs tct te- tea teb tec tee teg tei ten ter tes tet tga tgb tgc tge tgg tgi tgn tgr tgs tgt tia tib tic tie tig tii tin tir tis tit tna tnb tnc tne tng tni tnn tnr tns tnt tra trb trc tre