a-a a-b a-i a-t aaa aab aag aai aan aar aas aat ab- aba abb abg abi abn abr abs abt ag- aga agb agg agi agn agr ags agt ai- aia aib aig aii ain air ais ait an- ana anb ang ani ann anr ans ant ar- ara arb arg ari arn arr ars art as- asa asb asg asi asn asr ass ast at- ata atb atg ati atn atr ats att baa bab bag bai ban bar bas bat bba bbb bbg bbi bbn bbr bbs bbt bga bgb bgg bgi bgn bgr bgs bgt bi- bia bib big bii bin bir bis bit bna bnb bng bni bnn bnr bns bnt bra brb brg bri brn brr brs brt bsa bsb bsg bsi bsn bsr bss bst bta btb btg bti btn btr bts btt gaa gab gag gai gan gar gas gat gba gbg gbi gbn gbr gbs gbt gga ggb ggg ggi ggn ggr ggs ggt gia gib gig gii gin gir gis git gna gnb gni gnn gnr gns gnt gra grb grg gri grn grr grs grt gsa gsb gsg gsi gsn gsr gss gst gta gtb gtg gti gtn gtr gts gtt ia- iaa iab iag iai ian iar ias iat iba ibb ibg ibi ibn ibr ibs ibt iga igb igg igi ign igr igs igt iia iib iii iin iir iis iit in- ina inb ing ini inn inr ins int ir- ira irb irg iri irn irr irs irt is- isa isb isg isi isn isr iss ist ita itb itg iti itn its itt n-i naa nab nag nai nan nar nas nat nba nbb nbg nbi nbn nbr nbs nbt nga ngb ngg ngi ngn ngs ngt nia nib nig nii nin nir nis nit nna nnb nng nni nnn nns nnt nra nrb nrg nri nrn nrr nrs nrt nsa nsb nsg nsi nsn nsr nss nst nta ntb ntg nti ntn ntr nts ntt ra- raa rab rag rai ran rar ras rat rba rbb rbg rbi rbn rbr rbs rbt rga rgb rgg rgi rgn rgr rgs rgt ria rib rig rii rin rir ris rit rna rnb rng rni rnn rnr rns rnt rra rrb rrg rri rrn rrr rrs rrt rsa rsb rsg rsi rsn rsr rss rst rta rtb rtg rti rtn rtr rts rtt saa sab sag sai san sar sas sat sba sbb sbg sbi sbn sbr sbs sbt sga sgb sgg sgi sgn sgr sgs sgt sia sib sig sii sin sir sis sit sna snb sng sni snn snr sns snt sr- sra srb srg sri srn srr srs srt ss- ssa ssb ssg ssi ssn ssr sss sst sta stb stg sti stn str sts stt taa tab tag tai tan tar tas tat tba tbb tbg tbi tbn tbr tbs tbt tga tgb tgg tgi tgn tgr tgs tgt tia tib tig tii tin tir tis tit tna tnb tng tni tnn tnr tns tnt tra trb trg tri trn trr trs trt tsa tsb tsg tsi tsn tsr tss tst tta ttb ttg tti ttn ttr tts ttt