a-a a-b a-i a-t aaa aab aag aai aan aar aat ab- aba abb abg abi abn abr abt ag- aga agb agg agi agn agr agt ai- aia aib aig aii ain air ait an- ana anb ang ani ann anr ant ar- ara arb arg ari arn arr art at- ata atb atg ati atn atr att baa bab bag bai ban bar bat bba bbb bbg bbi bbn bbr bbt bga bgb bgg bgi bgn bgr bgt bi- bia bib big bii bin bir bit bna bnb bng bni bnn bnr bnt bra brb brg bri brn brr brt bta btb btg bti btn btr btt gaa gab gag gai gan gar gat gba gbg gbi gbn gbr gbt gga ggb ggg ggi ggn ggr ggt gia gib gig gii gin gir git gna gnb gni gnn gnr gnt gra grb grg gri grn grr grt gta gtb gtg gti gtn gtr gtt ia- iaa iab iag iai ian iar iat iba ibb ibg ibi ibn ibr ibt iga igb igg igi ign igr igt iia iib iii iin iir iit in- ina inb ing ini inn inr int ir- ira irb irg iri irn irr irt ita itb itg iti itn itt n-i naa nab nag nai nan nar nat nba nbb nbg nbi nbn nbr nbt nga ngb ngg ngi ngn ngt nia nib nig nii nin nir nit nna nnb nng nni nnn nnt nra nrb nrg nri nrn nrr nrt nta ntb ntg nti ntn ntr ntt ra- raa rab rag rai ran rar rat rba rbb rbg rbi rbn rbr rbt rga rgb rgg rgi rgn rgr rgt ria rib rig rii rin rir rit rna rnb rng rni rnn rnr rnt rra rrb rrg rri rrn rrr rrt rta rtb rtg rti rtn rtr rtt taa tab tag tai tan tar tat tba tbb tbg tbi tbn tbr tbt tga tgb tgg tgi tgn tgr tgt tia tib tig tii tin tir tit tna tnb tng tni tnn tnr tnt tra trb trg tri trn trr trt tta ttb ttg tti ttn ttr ttt