a-a a-b a-i a-t aaa aab aag aai aak aan aar aat ab- aba abb abg abi abk abn abr abt ag- aga agb agg agi agk agn agr agt ai- aia aib aig aii aik ain air ait aka akb akg aki akk akn akr an- ana anb ang ani ank ann anr ant ar- ara arb arg ari ark arn arr art at- ata atb atg ati atn atr att baa bab bag bai bak ban bar bat bba bbb bbg bbi bbk bbn bbr bbt bga bgb bgg bgi bgk bgn bgr bgt bi- bia bib big bii bik bin bir bit bka bkb bkg bkk bkn bkr bkt bna bnb bng bni bnk bnn bnr bnt bra brb brg bri brk brn brr brt bta btb btg bti btk btn btr btt gaa gab gag gai gak gan gar gat gba gbg gbi gbk gbn gbr gbt gga ggb ggg ggi ggn ggr ggt gia gib gig gii gik gin gir git gka gkb gkn gkt gna gnb gni gnn gnr gnt gra grb grg gri grk grn grr grt gta gtb gtg gti gtk gtn gtr gtt ia- iaa iab iag iai ian iar iat iba ibb ibg ibi ibk ibn ibr ibt iga igb igg igi igk ign igr igt iia iib iii iin iir iit ika ikb iki ikk ikr ikt in- ina inb ing ini ink inn inr int ir- ira irb irg iri irk irn irr irt ita itb itg iti itk itn itt k-t ka- kaa kab kag kai kak kan kar kat kba kbb kbi kbk kbn kbr kga kgb kgi kia kib kig kii kik kin kir kit kkb kki kkk kkn kkr kkt kn- kna kng kni knk knn knr knt kra krg kri krk krn krr krt kta ktb ktg ktk ktn ktr ktt n-i naa nab nag nai nak nan nar nat nba nbb nbg nbi nbk nbn nbr nbt nga ngb ngg ngi ngk ngn ngt nia nib nig nii nik nin nir nit nka nki nkk nkn nkr nkt nna nnb nng nni nnk nnn nnt nra nrb nrg nri nrk nrn nrr nrt nta ntb ntg nti ntk ntn ntr ntt ra- raa rab rag rai rak ran rar rat rba rbb rbg rbi rbk rbn rbr rbt rga rgb rgg rgi rgk rgn rgr rgt ria rib rig rii rik rin rir rit rkb rkg rkk rkt rna rnb rng rni rnn rnr rnt rra rrb rrg rri rrk rrn rrr rrt rta rtb rtg rti rtk rtn rtr rtt taa tab tag tai tak tan tar tat tba tbb tbg tbi tbk tbn tbr tbt tga tgb tgg tgi tgk tgn tgr tgt tia tib tig tii tik tin tir tit tka tkb tkg tkk tkr tkt tna tnb tng tni tnk tnn tnr tnt tra trb trg tri trk trn trr trt tta ttb ttg tti ttk ttn ttr ttt