a-a a-b a-t aaa aab aag aan aao aar aas aat ab- aba abb abg abn abo abr abs abt ag- aga agb agg agn ago agr ags agt an- ana anb ang ann ano anr ans ant aoa aob aog aon aoo aor aos aot ar- ara arb arg arn aro arr ars art as- asa asb asg asn aso asr ass ast at- ata atb atg atn ato atr ats att baa bab bag ban bao bar bas bat bba bbb bbg bbn bbo bbr bbs bbt bga bgb bgg bgn bgo bgr bgs bgt bna bnb bng bnn bno bnr bns bnt boa bob bog bon boo bor bos bot bra brb brg brn bro brr brs brt bsa bsb bsg bsn bso bsr bss bst bta btb btg btn bto btr bts btt gaa gab gag gan gao gar gas gat gba gbg gbn gbo gbr gbs gbt gga ggb ggg ggn ggo ggr ggs ggt gna gnb gnn gno gnr gns gnt goa gob gog gon goo gor gos got gra grb grg grn gro grr grs grt gsa gsb gsg gsn gso gsr gss gst gta gtb gtg gtn gto gtr gts gtt naa nab nag nan nao nar nas nat nba nbb nbg nbn nbo nbr nbs nbt nga ngb ngg ngn ngo ngs ngt nna nnb nng nnn nno nns nnt no- noa nob nog non noo nor nos not nra nrb nrg nrn nro nrr nrs nrt nsa nsb nsg nsn nso nsr nss nst nta ntb ntg ntn nto ntr nts ntt oaa oab oag oan oao oar oas oat ob- oba obb obg obn obo obr obs obt oga ogg ogn ogo ogs ogt on- ona onb ong onn ono onr ons ont oo- ooa oob oog oon ooo oor oos oot or- ora orb org orn oro orr ors ort os- osa osb osg osn oso osr oss ost ot- ota otb otg otn oto otr ots ott ra- raa rab rag ran rao rar ras rat rba rbb rbg rbn rbo rbr rbs rbt rga rgb rgg rgn rgo rgr rgs rgt rna rnb rng rnn rno rnr rns rnt roa rob rog ron roo ror ros rot rra rrb rrg rrn rrr rrs rrt rsa rsb rsg rsn rso rsr rss rst rta rtb rtg rtn rto rtr rts rtt saa sab sag san sao sar sas sat sba sbb sbg sbn sbo sbr sbs sbt sga sgb sgg sgn sgo sgr sgs sgt sna snb sng snn sno snr sns snt soa sob sog son soo sor sos sot sr- sra srb srg srn sro srr srs srt ss- ssa ssb ssg ssn sso ssr sss sst sta stb stg stn sto str sts stt taa tab tag tan tao tar tas tat tba tbb tbg tbn tbo tbr tbs tbt tga tgb tgg tgn tgo tgr tgs tgt tna tnb tng tnn tno tnr tns tnt to- toa tob tog ton too tor tos tot tra trb trg trn tro trr trs trt tsa tsb tsg tsn tso tsr tss tst tta ttb ttg ttn tto ttr tts ttt