a-a a-b a-i a-t aaa aab aag aai aao aar aat aau ab- aba abb abg abi abo abr abt abu ag- aga agb agg agi ago agr agt agu ai- aia aib aig aii aio air ait aiu aoa aob aog aoi aoo aor aot aou ar- ara arb arg ari aro arr art aru at- ata atb atg ati ato atr att atu au- aua aub aug aui auo aur aut b-u baa bab bag bai bao bar bat bau bba bbb bbg bbi bbo bbr bbt bbu bga bgb bgg bgi bgo bgr bgt bgu bi- bia bib big bii bio bir bit biu boa bob bog boi boo bor bot bou bra brb brg bri bro brr brt bru bta btb btg bti bto btr btt btu bua bub bug bui buo bur but buu gaa gab gag gai gao gar gat gau gba gbg gbi gbo gbr gbt gbu gga ggb ggg ggi ggo ggr ggt ggu gia gib gig gii gio gir git giu goa gob gog goi goo gor got gou gra grb grg gri gro grr grt gru gta gtb gtg gti gto gtr gtt gtu gu- gua gub gug gui guo gur gut guu ia- iaa iab iag iai iao iar iat iau iba ibb ibg ibi ibo ibr ibt ibu iga igb igg igi igo igr igt igu iia iib iii iio iir iit iiu io- ioa iob iog ioi ioo ior iot iou ir- ira irb irg iri iro irr irt iru ita itb itg iti ito itt itu iu- iua iub iug iui iur iut o-i oaa oab oag oai oao oar oat oau ob- oba obb obg obi obo obr obt obu oga ogg ogi ogo ogt oia oib oii oio oir oit oiu oo- ooa oob oog ooi ooo oor oot or- ora orb org ori oro orr ort oru ot- ota otb otg oti oto otr ott otu ou- oua oui ouo our out ra- raa rab rag rai rao rar rat rau rba rbb rbg rbi rbo rbr rbt rbu rga rgb rgg rgi rgo rgr rgt ria rib rig rii rio rir rit roa rob rog roi roo ror rot rou rra rrb rrg rri rrr rrt rru rta rtb rtg rti rto rtr rtt rtu rua rub rug rui ruo rur rut ruu taa tab tag tai tao tar tat tau tba tbb tbg tbi tbo tbr tbt tbu tga tgb tgg tgi tgo tgr tgt tgu tia tib tig tii tio tir tit tiu to- toa tob tog toi too tor tot tou tra trb trg tri tro trr trt tru tta ttb ttg tti tto ttr ttt ttu tua tub tug tui tuo tur tut tuu ua- uaa uab uag uai uao uar uat uau uba ubb ubg ubi ubo ubr ubt ubu uga ugb ugg ugi ugo ugr ugt ugu uia uib uig uii uio uir uit uiu uoa uob uog uoo uor uot ur- ura urb urg uri uro urr urt uru uta utb uti uto utr utt utu uua uug uur uut uuu