a-a a-b a-i aaa aab aag aai aan aas ab- aba abb abg abi abn abs ag- aga agb agg agi agn ags ai- aia aib aig aii ain ais an- ana anb ang ani ann ans as- asa asb asg asi asn ass baa bab bag bai ban bas bba bbb bbg bbi bbn bbs bga bgb bgg bgi bgn bgs bi- bia bib big bii bin bis bna bnb bng bni bnn bns bsa bsb bsg bsi bsn bss gaa gab gag gai gan gas gba gbg gbi gbn gbs gga ggb ggg ggi ggn ggs gia gib gig gii gin gis gna gnb gni gnn gns gsa gsb gsg gsi gsn gss ia- iaa iab iag iai ian ias iba ibb ibg ibi ibn ibs iga igb igg igi ign igs iia iib iii iin iis in- ina inb ing ini inn ins is- isa isb isg isi isn iss n-i naa nab nag nai nan nas nba nbb nbg nbi nbn nbs nga ngb ngg ngi ngn ngs nia nib nig nii nin nis nna nnb nng nni nnn nns nsa nsb nsg nsi nsn nss saa sab sag sai san sas sba sbb sbg sbi sbn sbs sga sgb sgg sgi sgn sgs sia sib sig sii sin sis sna snb sng sni snn sns ss- ssa ssb ssg ssi ssn sss