a-a a-b a-i aaa aab aag aai aan aar aas ab- aba abb abg abi abn abr abs ag- aga agb agg agi agn agr ags ai- aia aib aig aii ain air ais an- ana anb ang ani ann anr ans ar- ara arb arg ari arn arr ars as- asa asb asg asi asn asr ass baa bab bag bai ban bar bas bba bbb bbg bbi bbn bbr bbs bga bgb bgg bgi bgn bgr bgs bi- bia bib big bii bin bir bis bna bnb bng bni bnn bnr bns bra brb brg bri brn brr brs bsa bsb bsg bsi bsn bsr bss gaa gab gag gai gan gar gas gba gbg gbi gbn gbr gbs gga ggb ggg ggi ggn ggr ggs gia gib gig gii gin gir gis gna gnb gni gnn gnr gns gra grb grg gri grn grr grs gsa gsb gsg gsi gsn gsr gss ia- iaa iab iag iai ian iar ias iba ibb ibg ibi ibn ibr ibs iga igb igg igi ign igr igs iia iib iii iin iir iis in- ina inb ing ini inn inr ins ir- ira irb irg iri irn irr irs is- isa isb isg isi isn isr iss n-i naa nab nag nai nan nar nas nba nbb nbg nbi nbn nbr nbs nga ngb ngg ngi ngn ngs nia nib nig nii nin nir nis nna nnb nng nni nnn nns nra nrb nrg nri nrn nrr nrs nsa nsb nsg nsi nsn nsr nss ra- raa rab rag rai ran rar ras rba rbb rbg rbi rbn rbr rbs rga rgb rgg rgi rgn rgr rgs ria rib rig rii rin rir ris rna rnb rng rni rnn rnr rns rra rrb rrg rri rrn rrr rrs rsa rsb rsg rsi rsn rsr rss saa sab sag sai san sar sas sba sbb sbg sbi sbn sbr sbs sga sgb sgg sgi sgn sgr sgs sia sib sig sii sin sir sis sna snb sng sni snn snr sns sr- sra srb srg sri srn srr srs ss- ssa ssb ssg ssi ssn ssr sss