a-a a-b a-t aaa aab aaf aag aan aao aat aau ab- aba abb abf abg abn abo abt abu af- afa afb aff afg afn afo aft afu ag- aga agb agf agg agn ago agt agu an- ana anb anf ang ann ano ant anu aoa aob aof aog aon aoo aot aou at- ata atb atf atg atn ato att atu au- aua aub auf aug aun auo aut b-u baa bab baf bag ban bao bat bau bba bbb bbf bbg bbn bbo bbt bbu bfa bfb bff bfg bfn bfo bft bfu bga bgb bgf bgg bgn bgo bgt bgu bna bnb bnf bng bnn bno bnt bnu boa bob bof bog bon boo bot bou bta btb btf btg btn bto btt btu bua bub buf bug bun buo but buu faa fab faf fag fan fao fat fau fba fbb fbf fbg fbn fbo fbt fbu ffa fff ffg ffn ffo fft ffu fga fgb fgf fgg fgn fgt fna fnb fnf fng fnn fnt fnu foa fob fof fog fon foo fot fou fta ftb ftf ftg ftn fto ftt ftu fua fub fuf fug fun fuo fut fuu gaa gab gaf gag gan gao gat gau gba gbf gbg gbn gbo gbt gbu gfa gfb gff gfo gft gga ggb ggg ggn ggo ggt ggu gna gnb gnf gnn gno gnt gnu goa gob gof gog gon goo got gou gta gtb gtf gtg gtn gto gtt gtu gu- gua gub guf gug gun guo gut guu naa nab naf nag nan nao nat nau nba nbb nbf nbg nbn nbo nbt nbu nfa nfb nff nfn nfo nft nfu nga ngb ngf ngg ngn ngo ngt ngu nna nnb nnf nng nnn nno nnt nnu no- noa nob nof nog non noo not nou nta ntb ntf ntg ntn nto ntt ntu nua nub nug nun nuo nut nuu oaa oab oaf oag oan oao oat oau ob- oba obb obf obg obn obo obt obu of- ofa ofb off ofg ofn ofo oft ofu oga ogf ogg ogn ogo ogt on- ona onb onf ong onn ono ont onu oo- ooa oob oof oog oon ooo oot ot- ota otb otf otg otn oto ott otu ou- oua ouf oun ouo out taa tab taf tag tan tao tat tau tba tbb tbf tbg tbn tbo tbt tbu tfa tfb tff tfg tfn tfo tft tfu tga tgb tgf tgg tgn tgo tgt tgu tna tnb tnf tng tnn tno tnt to- toa tob tof tog ton too tot tou tta ttb ttf ttg ttn tto ttt ttu tua tub tuf tug tun tuo tut tuu ua- uaa uab uaf uag uan uao uat uau uba ubb ubf ubg ubn ubo ubt ubu ufa uff ufg ufn ufo uft ufu uga ugb ugf ugg ugn ugo ugt ugu un- una unb unf ung unn uno unt unu uoa uob uog uon uoo uot uta utb utf utn uto utt utu uua uug uun uut uuu