a-a a-b a-i a-t aaa aab aag aai aak aao aar aat ab- aba abb abg abi abk abo abr abt ag- aga agb agg agi agk ago agr agt ai- aia aib aig aii aik aio air ait aka akb akg aki akk ako akr aoa aob aog aoi aok aoo aor aot ar- ara arb arg ari ark aro arr art at- ata atb atg ati ato atr att baa bab bag bai bak bao bar bat bba bbb bbg bbi bbk bbo bbr bbt bga bgb bgg bgi bgk bgo bgr bgt bi- bia bib big bii bik bio bir bit bka bkb bkg bkk bko bkr bkt boa bob bog boi bok boo bor bot bra brb brg bri brk bro brr brt bta btb btg bti btk bto btr btt gaa gab gag gai gak gao gar gat gba gbg gbi gbk gbo gbr gbt gga ggb ggg ggi ggo ggr ggt gia gib gig gii gik gio gir git gka gkb gko gkt goa gob gog goi gok goo gor got gra grb grg gri grk gro grr grt gta gtb gtg gti gtk gto gtr gtt ia- iaa iab iag iai iao iar iat iba ibb ibg ibi ibk ibo ibr ibt iga igb igg igi igk igo igr igt iia iib iii iio iir iit ika ikb iki ikk iko ikr ikt io- ioa iob iog ioi ioo ior iot ir- ira irb irg iri irk iro irr irt ita itb itg iti itk ito itt k-t ka- kaa kab kag kai kak kao kar kat kba kbb kbi kbk kbo kbr kga kgb kgi kgo kia kib kig kii kik kio kir kit kkb kki kkk kkr kkt koa kob kog koi kok koo kor kot kra krg kri krk kro krr krt kta ktb ktg ktk kto ktr ktt o-i oaa oab oag oai oak oao oar oat ob- oba obb obg obi obk obo obr obt oga ogg ogi ogo ogt oia oib oii oik oio oir oit oka okb okg oki okk oko okr oo- ooa oob oog ooi ook ooo oor oot or- ora orb org ori ork oro orr ort ot- ota otb otg oti otk oto otr ott ra- raa rab rag rai rak rao rar rat rba rbb rbg rbi rbk rbo rbr rbt rga rgb rgg rgi rgk rgo rgr rgt ria rib rig rii rik rio rir rit rkb rkg rkk rko rkt roa rob rog roi rok roo ror rot rra rrb rrg rri rrk rrr rrt rta rtb rtg rti rtk rto rtr rtt taa tab tag tai tak tao tar tat tba tbb tbg tbi tbk tbo tbr tbt tga tgb tgg tgi tgk tgo tgr tgt tia tib tig tii tik tio tir tit tka tkb tkg tkk tko tkr tkt to- toa tob tog toi tok too tor tot tra trb trg tri trk tro trr trt tta ttb ttg tti ttk tto ttr ttt