a-a a-b a-i a-t aaa aab aag aai aan aas aat ab- aba abb abg abi abn abs abt ag- aga agb agg agi agn ags agt ai- aia aib aig aii ain ais ait an- ana anb ang ani ann ans ant as- asa asb asg asi asn ass ast at- ata atb atg ati atn ats att baa bab bag bai ban bas bat bba bbb bbg bbi bbn bbs bbt bga bgb bgg bgi bgn bgs bgt bi- bia bib big bii bin bis bit bna bnb bng bni bnn bns bnt bsa bsb bsg bsi bsn bss bst bta btb btg bti btn bts btt gaa gab gag gai gan gas gat gba gbg gbi gbn gbs gbt gga ggb ggg ggi ggn ggs ggt gia gib gig gii gin gis git gna gnb gni gnn gns gnt gsa gsb gsg gsi gsn gss gst gta gtb gtg gti gtn gts gtt ia- iaa iab iag iai ian ias iat iba ibb ibg ibi ibn ibs ibt iga igb igg igi ign igs igt iia iib iii iin iis iit in- ina inb ing ini inn ins int is- isa isb isg isi isn iss ist ita itb itg iti itn its itt n-i naa nab nag nai nan nas nat nba nbb nbg nbi nbn nbs nbt nga ngb ngg ngi ngn ngs ngt nia nib nig nii nin nis nit nna nnb nng nni nnn nns nnt nsa nsb nsg nsi nsn nss nst nta ntb ntg nti ntn nts ntt saa sab sag sai san sas sat sba sbb sbg sbi sbn sbs sbt sga sgb sgg sgi sgn sgs sgt sia sib sig sii sin sis sit sna snb sng sni snn sns snt ss- ssa ssb ssg ssi ssn sss sst sta stb stg sti stn sts stt taa tab tag tai tan tas tat tba tbb tbg tbi tbn tbs tbt tga tgb tgg tgi tgn tgs tgt tia tib tig tii tin tis tit tna tnb tng tni tnn tns tnt tsa tsb tsg tsi tsn tss tst tta ttb ttg tti ttn tts ttt