a-a a-b a-t aaa aab aag aan aao aat aau ab- aba abb abg abn abo abt abu ag- aga agb agg agn ago agt agu an- ana anb ang ann ano ant anu aoa aob aog aon aoo aot aou at- ata atb atg atn ato att atu au- aua aub aug aun auo aut b-u baa bab bag ban bao bat bau bba bbb bbg bbn bbo bbt bbu bga bgb bgg bgn bgo bgt bgu bna bnb bng bnn bno bnt bnu boa bob bog bon boo bot bou bta btb btg btn bto btt btu bua bub bug bun buo but buu gaa gab gag gan gao gat gau gba gbg gbn gbo gbt gbu gga ggb ggg ggn ggo ggt ggu gna gnb gnn gno gnt gnu goa gob gog gon goo got gou gta gtb gtg gtn gto gtt gtu gu- gua gub gug gun guo gut guu naa nab nag nan nao nat nau nba nbb nbg nbn nbo nbt nbu nga ngb ngg ngn ngo ngt ngu nna nnb nng nnn nno nnt nnu no- noa nob nog non noo not nou nta ntb ntg ntn nto ntt ntu nua nub nug nun nuo nut nuu oaa oab oag oan oao oat oau ob- oba obb obg obn obo obt obu oga ogg ogn ogo ogt on- ona onb ong onn ono ont onu oo- ooa oob oog oon ooo oot ot- ota otb otg otn oto ott otu ou- oua oun ouo out taa tab tag tan tao tat tau tba tbb tbg tbn tbo tbt tbu tga tgb tgg tgn tgo tgt tgu tna tnb tng tnn tno tnt to- toa tob tog ton too tot tou tta ttb ttg ttn tto ttt ttu tua tub tug tun tuo tut tuu ua- uaa uab uag uan uao uat uau uba ubb ubg ubn ubo ubt ubu uga ugb ugg ugn ugo ugt ugu un- una unb ung unn uno unt unu uoa uob uog uon uoo uot uta utb utn uto utt utu uua uug uun uut uuu