a-a a-b aaa aab aag aan aao aau ab- aba abb abg abn abo abu ag- aga agb agg agn ago agu an- ana anb ang ann ano anu aoa aob aog aon aoo aou au- aua aub aug aun auo b-u baa bab bag ban bao bau bba bbb bbg bbn bbo bbu bga bgb bgg bgn bgo bgu bna bnb bng bnn bno bnu boa bob bog bon boo bou bua bub bug bun buo buu gaa gab gag gan gao gau gba gbg gbn gbo gbu gga ggb ggg ggn ggo ggu gna gnb gnn gno gnu goa gob gog gon goo gou gu- gua gub gug gun guo guu naa nab nag nan nao nau nba nbb nbg nbn nbo nbu nga ngb ngg ngn ngo ngu nna nnb nng nnn nno nnu no- noa nob nog non noo nou nua nub nug nun nuo nuu oaa oab oag oan oao oau ob- oba obb obg obn obo obu oga ogg ogn ogo on- ona onb ong onn ono onu oo- ooa oob oog oon ooo ou- oua oun ouo ua- uaa uab uag uan uao uau uba ubb ubg ubn ubo ubu uga ugb ugg ugn ugo ugu un- una unb ung unn uno unu uoa uob uog uon uoo uua uug uun uuu