-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aan aar aas aat ab- aba abb abc abg abi abn abr abs abt ac- aca acb acc acg aci acn acr acs act ag- aga agb agc agg agi agn agr ags agt ai- aia aib aic aig aii ain air ais ait an- ana anb anc ang ani ann anr ans ant ar- ara arb arc arg ari arn arr ars art as- asa asb asc asg asi asn asr ass ast at- ata atb atc atg ati atn atr ats att baa bab bac bag bai ban bar bas bat bba bbb bbc bbg bbi bbn bbr bbs bbt bca bcb bcc bcg bci bcn bcr bcs bct bga bgb bgc bgg bgi bgn bgr bgs bgt bi- bia bib bic big bii bin bir bis bit bna bnb bnc bng bni bnn bnr bns bnt bra brb brg bri brn brr brs brt bsa bsb bsc bsg bsi bsn bsr bss bst bta btb btc btg bti btn btr bts btt c-- caa cab cac cag cai can car cas cat cba cbb cbc cbg cbi cbn cbr cbs cbt cca ccb ccc ccg cci ccn ccr ccs cct cga cgb cgc cgg cgi cgn cgr cgs cgt ci- cia cib cic cig cii cin cir cis cit cn- cna cnb cnc cng cni cnn cnr cns cnt cra crb crc crg cri crn crr crs crt csa csb csc csg csi csn csr css cst cta ctb ctc ctg cti ctn ctr cts ctt gaa gab gac gag gai gan gar gas gat gba gbc gbg gbi gbn gbr gbs gbt gca gcb gcc gcg gci gcn gcr gcs gct gga ggb ggc ggg ggi ggn ggr ggs ggt gia gib gic gig gii gin gir gis git gna gnb gnc gni gnn gnr gns gnt gra grb grc grg gri grn grr grs grt gsa gsb gsc gsg gsi gsn gsr gss gst gta gtb gtc gtg gti gtn gtr gts gtt ia- iaa iab iac iag iai ian iar ias iat iba ibb ibc ibg ibi ibn ibr ibs ibt ica icb icc icg ici icn icr ics ict iga igb igc igg igi ign igr igs igt iia iib iic iii iin iir iis iit in- ina inb inc ing ini inn inr ins int ir- ira irb irc irg iri irn irr irs irt is- isa isb isc isg isi isn isr iss ist ita itb itc itg iti itn its itt n-i naa nab nac nag nai nan nar nas nat nba nbb nbc nbg nbi nbn nbr nbs nbt nca ncb ncc ncg nci ncn ncr ncs nct nga ngb ngc ngg ngi ngn ngs ngt nia nib nic nig nii nin nir nis nit nna nnb nnc nng nni nnn nns nnt nra nrb nrc nrg nri nrn nrr nrs nrt nsa nsb nsc nsg nsi nsn nsr nss nst nta ntb ntc ntg nti ntn ntr nts ntt ra- raa rab rac rag rai ran rar ras rat rba rbb rbc rbg rbi rbn rbr rbs rbt rca rcb rcc rcg rci rcn rcr rcs rct rga rgb rgc rgg rgi rgn rgr rgs rgt ria rib ric 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 rsg rsi rsn rsr rss rst rta rtb rtc rtg rti rtn rtr rts rtt saa sab sac sag sai san sar sas sat sba sbb sbc sbg sbi sbn sbr sbs sbt sca scb scc scg sci scn scr scs sct sga sgb sgc sgg sgi sgn sgr sgs sgt sia sib sic sig sii sin sir sis sit sna snb snc sng sni snn snr sns snt sr- sra srb src srg sri srn srr srs srt ss- ssa ssb ssc ssg ssi ssn ssr sss sst sta stb stc stg sti stn str sts stt taa tab tac tag tai tan tar tas tat tba tbb tbc tbg tbi tbn tbr tbs tbt tca tcb tcc tcg tci tcn tcr tcs tct tga tgb tgc tgg tgi tgn tgr tgs tgt tia tib tic tig tii tin tir tis tit tna tnb tnc tng tni tnn tnr tns tnt tra trb trc trg tri trn trr trs trt tsa tsb tsc tsg tsi tsn tsr tss tst tta ttb ttc ttg tti ttn ttr tts ttt