a-a a-b aaa aab aag aak aan aar aau ab- aba abb abg abk abn abr abu ag- aga agb agg agk agn agr agu aka akb akg akk akn akr aku an- ana anb ang ank ann anr anu ar- ara arb arg ark arn arr aru au- aua aub aug auk aun aur b-u baa bab bag bak ban bar bau bba bbb bbg bbk bbn bbr bbu bga bgb bgg bgk bgn bgr bgu bka bkb bkg bkk bkn bkr bna bnb bng bnk bnn bnr bnu bra brb brg brk brn brr bru bua bub bug buk bun bur buu gaa gab gag gak gan gar gau gba gbg gbk gbn gbr gbu gga ggb ggg ggn ggr ggu gka gkb gkn gna gnb gnn gnr gnu gra grb grg grk grn grr gru gu- gua gub gug guk gun gur guu ka- kaa kab kag kak kan kar kau kba kbb kbk kbn kbr kbu kga kgb kgu kkb kkk kkn kkr kku kn- kna kng knk knn knr knu kra krg krk krn krr kru kub kug kuk kun kur kuu naa nab nag nak nan nar nau nba nbb nbg nbk nbn nbr nbu nga ngb ngg ngk ngn ngu nka nkk nkn nkr nku nna nnb nng nnk nnn nnu nra nrb nrg nrk nrn nrr nru nua nub nug nuk nun nur nuu ra- raa rab rag rak ran rar rau rba rbb rbg rbk rbn rbr rbu rga rgb rgg rgk rgn rgr rkb rkg rkk rku rna rnb rng rnn rnr rnu rra rrb rrg rrk rrn rrr rru rua rub rug ruk run rur ruu ua- uaa uab uag uak uan uar uau uba ubb ubg ubk ubn ubr ubu uga ugb ugg ugk ugn ugr ugu uka ukb ukk ukn ukr uku un- una unb ung unk unn unr unu ur- ura urb urg urk urn urr uru uua uug uun uur uuu