a-a a-b a-i a-t aaa aab aag aai aan aao aar aat ab- aba abb abg abi abn abo abr abt ag- aga agb agg agi agn ago agr agt ai- aia aib aig aii ain aio air ait an- ana anb ang ani ann ano anr ant aoa aob aog aoi aon aoo aor aot ar- ara arb arg ari arn aro arr art at- ata atb atg ati atn ato atr att baa bab bag bai ban bao bar bat bba bbb bbg bbi bbn bbo bbr bbt bga bgb bgg bgi bgn bgo bgr bgt bi- bia bib big bii bin bio bir bit bna bnb bng bni bnn bno bnr bnt boa bob bog boi bon boo bor bot bra brb brg bri brn bro brr brt bta btb btg bti btn bto btr btt gaa gab gag gai gan gao gar gat gba gbg gbi gbn gbo gbr gbt gga ggb ggg ggi ggn ggo ggr ggt gia gib gig gii gin gio gir git gna gnb gni gnn gno gnr gnt goa gob gog goi gon goo gor got gra grb grg gri grn gro grr grt gta gtb gtg gti gtn gto gtr gtt ia- iaa iab iag iai ian iao iar iat iba ibb ibg ibi ibn ibo ibr ibt iga igb igg igi ign igo igr igt iia iib iii iin iio iir iit in- ina inb ing ini inn ino inr int io- ioa iob iog ioi ion ioo ior iot ir- ira irb irg iri irn iro irr irt ita itb itg iti itn ito itt n-i naa nab nag nai nan nao nar nat nba nbb nbg nbi nbn nbo nbr nbt nga ngb ngg ngi ngn ngo ngt nia nib nig nii nin nio nir nit nna nnb nng nni nnn nno nnt no- noa nob nog noi non noo nor not nra nrb nrg nri nrn nro nrr nrt nta ntb ntg nti ntn nto ntr ntt o-i oaa oab oag oai oan oao oar oat ob- oba obb obg obi obn obo obr obt oga ogg ogi ogn ogo ogt oia oib oii oin oio oir oit on- ona onb ong oni onn ono onr ont oo- ooa oob oog ooi oon ooo oor oot or- ora orb org ori orn oro orr ort ot- ota otb otg oti otn oto otr ott ra- raa rab rag rai ran rao rar rat rba rbb rbg rbi rbn rbo rbr rbt rga rgb rgg rgi rgn rgo rgr rgt ria rib rig rii rin rio rir rit rna rnb rng rni rnn rno rnr rnt roa rob rog roi ron roo ror rot rra rrb rrg rri rrn rrr rrt rta rtb rtg rti rtn rto rtr rtt taa tab tag tai tan tao tar tat tba tbb tbg tbi tbn tbo tbr tbt tga tgb tgg tgi tgn tgo tgr tgt tia tib tig tii tin tio tir tit tna tnb tng tni tnn tno tnr tnt to- toa tob tog toi ton too tor tot tra trb trg tri trn tro trr trt tta ttb ttg tti ttn tto ttr ttt