a-a a-b a-t aaa aab aae aag aan aao aas aat ab- aba abb abe abg abn abo abs abt aea aeb aee aeg aen aeo aes aet ag- aga agb age agg agn ago ags agt an- ana anb ane ang ann ano ans ant aoa aob aoe aog aon aoo aos aot as- asa asb ase asg asn aso ass ast at- ata atb ate atg atn ato ats att baa bab bae bag ban bao bas bat bba bbb bbe bbg bbn bbo bbs bbt be- bea beb bee beg ben beo bes bet bga bgb bge bgg bgn bgo bgs bgt bna bnb bne bng bnn bno bns bnt boa bob boe bog bon boo bos bot bsa bsb bse bsg bsn bso bss bst bta btb bte btg btn bto bts btt eaa eab eae eag ean eao eas eat eba ebb ebe ebg ebn ebo ebs ebt eea eeb eee eeg een eeo ees eet ega egb ege egg egn ego egs egt en- ena enb ene eng enn eno ens ent eo- eoa eob eoe eog eon eoo eos eot es- esa esb ese esg esn eso ess est eta etb ete etg etn eto ets ett gaa gab gae gag gan gao gas gat gba gbe gbg gbn gbo gbs gbt ge- gea geb gee geg gen geo ges get gga ggb ggg ggn ggo ggs ggt gna gnb gne gnn gno gns gnt goa gob goe gog gon goo gos got gsa gsb gse gsg gsn gso gss gst gta gtb gte gtg gtn gto gts gtt naa nab nae nag nan nao nas nat nba nbb nbe nbg nbn nbo nbs nbt ne- nea neb nee neg nen neo nes net nga ngb nge ngg ngn ngo ngs ngt nna nnb nne nng nnn nno nns nnt no- noa nob noe nog non noo nos not nsa nsb nse nsg nsn nso nss nst nta ntb nte ntg ntn nto nts ntt oaa oab oae oag oan oao oas oat ob- oba obb obe obg obn obo obs obt oea oeb oee oeg oen oeo oes oet oga oge ogg ogn ogo ogs ogt on- ona onb one ong onn ono ons ont oo- ooa oob oog oon ooo oos oot os- osa osb ose osg osn oso oss ost ot- ota otb ote otg otn oto ots ott saa sab sae sag san sao sas sat sba sbb sbe sbg sbn sbo sbs sbt se- sea seb see seg sen seo ses set sga sgb sge sgg sgn sgo sgs sgt sna snb sne sng snn sno sns snt soa sob soe sog son soo sos sot ss- ssa ssb sse ssg ssn sso sss sst sta stb ste stg stn sto sts stt taa tab tae tag tan tao tas tat tba tbb tbe tbg tbn tbo tbs tbt te- tea teb tee teg ten teo tes tet tga tgb tge tgg tgn tgo tgs tgt tna tnb tne tng tnn tno tns tnt to- toa tob toe tog ton too tos tot tsa tsb tse tsg tsn tso tss tst tta ttb tte ttg ttn tto tts ttt