a-a a-b a-t aaa aab aag aan aao aas aat ab- aba abb abg abn abo abs abt ag- aga agb agg agn ago ags agt an- ana anb ang ann ano ans ant aoa aob aog aon aoo aos aot as- asa asb asg asn aso ass ast at- ata atb atg atn ato ats att baa bab bag ban bao bas bat bba bbb bbg bbn bbo bbs bbt bga bgb bgg bgn bgo bgs bgt bna bnb bng bnn bno bns bnt boa bob bog bon boo bos bot bsa bsb bsg bsn bso bss bst bta btb btg btn bto bts btt gaa gab gag gan gao gas gat gba gbg gbn gbo gbs gbt gga ggb ggg ggn ggo ggs ggt gna gnb gnn gno gns gnt goa gob gog gon goo gos got gsa gsb gsg gsn gso gss gst gta gtb gtg gtn gto gts gtt naa nab nag nan nao nas nat nba nbb nbg nbn nbo nbs nbt nga ngb ngg ngn ngo ngs ngt nna nnb nng nnn nno nns nnt no- noa nob nog non noo nos not nsa nsb nsg nsn nso nss nst nta ntb ntg ntn nto nts ntt oaa oab oag oan oao oas oat ob- oba obb obg obn obo obs obt oga ogg ogn ogo ogs ogt on- ona onb ong onn ono ons ont oo- ooa oob oog oon ooo oos oot os- osa osb osg osn oso oss ost ot- ota otb otg otn oto ots ott saa sab sag san sao sas sat sba sbb sbg sbn sbo sbs sbt sga sgb sgg sgn sgo sgs sgt sna snb sng snn sno sns snt soa sob sog son soo sos sot ss- ssa ssb ssg ssn sso sss sst sta stb stg stn sto sts stt taa tab tag tan tao tas tat tba tbb tbg tbn tbo tbs tbt tga tgb tgg tgn tgo tgs tgt tna tnb tng tnn tno tns tnt to- toa tob tog ton too tos tot tsa tsb tsg tsn tso tss tst tta ttb ttg ttn tto tts ttt