a-a a-b a-t aaa aab aag aao aar aat aau ab- aba abb abg abo abr abt abu ag- aga agb agg ago agr agt agu aoa aob aog aoo aor aot aou ar- ara arb arg aro arr art aru at- ata atb atg ato atr att atu au- aua aub aug auo aur aut b-u baa bab bag bao bar bat bau bba bbb bbg bbo bbr bbt bbu bga bgb bgg bgo bgr bgt bgu boa bob bog boo bor bot bou bra brb brg bro brr brt bru bta btb btg bto btr btt btu bua bub bug buo bur but buu gaa gab gag gao gar gat gau gba gbg gbo gbr gbt gbu gga ggb ggg ggo ggr ggt ggu goa gob gog goo gor got gou gra grb grg gro grr grt gru gta gtb gtg gto gtr gtt gtu gu- gua gub gug guo gur gut guu oaa oab oag oao oar oat oau ob- oba obb obg obo obr obt obu oga ogg ogo ogt oo- ooa oob oog ooo oor oot or- ora orb org oro orr ort oru ot- ota otb otg oto otr ott otu ou- oua ouo our out ra- raa rab rag rao rar rat rau rba rbb rbg rbo rbr rbt rbu rga rgb rgg rgo rgr rgt roa rob rog roo ror rot rou rra rrb rrg rrr rrt rru rta rtb rtg rto rtr rtt rtu rua rub rug ruo rur rut ruu taa tab tag tao tar tat tau tba tbb tbg tbo tbr tbt tbu tga tgb tgg tgo tgr tgt tgu to- toa tob tog too tor tot tou tra trb trg tro trr trt tru tta ttb ttg tto ttr ttt ttu tua tub tug tuo tur tut tuu ua- uaa uab uag uao uar uat uau uba ubb ubg ubo ubr ubt ubu uga ugb ugg ugo ugr ugt ugu uoa uob uog uoo uor uot ur- ura urb urg uro urr urt uru uta utb uto utr utt utu uua uug uur uut uuu