a-a a-b a-t aaa aab aag aan aar aas aat ab- aba abb abg abn abr abs abt ag- aga agb agg agn agr ags agt an- ana anb ang ann anr ans ant ar- ara arb arg arn arr ars art as- asa asb asg asn asr ass ast at- ata atb atg atn atr ats att baa bab bag ban bar bas bat bba bbb bbg bbn bbr bbs bbt bga bgb bgg bgn bgr bgs bgt bna bnb bng bnn bnr bns bnt bra brb brg brn brr brs brt bsa bsb bsg bsn bsr bss bst bta btb btg btn btr bts btt gaa gab gag gan gar gas gat gba gbg gbn gbr gbs gbt gga ggb ggg ggn ggr ggs ggt gna gnb gnn gnr gns gnt gra grb grg grn grr grs grt gsa gsb gsg gsn gsr gss gst gta gtb gtg gtn gtr gts gtt naa nab nag nan nar nas nat nba nbb nbg nbn nbr nbs nbt nga ngb ngg ngn ngs ngt nna nnb nng nnn nns nnt nra nrb nrg nrn nrr nrs nrt nsa nsb nsg nsn nsr nss nst nta ntb ntg ntn ntr nts ntt ra- raa rab rag ran rar ras rat rba rbb rbg rbn rbr rbs rbt rga rgb rgg rgn rgr rgs rgt rna rnb rng rnn rnr rns rnt rra rrb rrg rrn rrr rrs rrt rsa rsb rsg rsn rsr rss rst rta rtb rtg rtn rtr rts rtt saa sab sag san sar sas sat sba sbb sbg sbn sbr sbs sbt sga sgb sgg sgn sgr sgs sgt sna snb sng snn snr sns snt sr- sra srb srg srn srr srs srt ss- ssa ssb ssg ssn ssr sss sst sta stb stg stn str sts stt taa tab tag tan tar tas tat tba tbb tbg tbn tbr tbs tbt tga tgb tgg tgn tgr tgs tgt tna tnb tng tnn tnr tns tnt tra trb trg trn trr trs trt tsa tsb tsg tsn tsr tss tst tta ttb ttg ttn ttr tts ttt