b-u bbb bbg bbn bbo bbr bbu bgb bgg bgn bgo bgr bgu bnb bng bnn bno bnr bnu bob bog bon boo bor bou brb brg brn bro brr bru bub bug bun buo bur buu gbg gbn gbo gbr gbu ggb ggg ggn ggo ggr ggu gnb gnn gno gnr gnu gob gog gon goo gor gou grb grg grn gro grr gru gu- gub gug gun guo gur guu nbb nbg nbn nbo nbr nbu ngb ngg ngn ngo ngu nnb nng nnn nno nnu no- nob nog non noo nor nou nrb nrg nrn nro nrr nru nub nug nun nuo nur nuu ob- obb obg obn obo obr obu ogg ogn ogo on- onb ong onn ono onr onu oo- oob oog oon ooo oor or- orb org orn oro orr oru ou- oun ouo our rbb rbg rbn rbo rbr rbu rgb rgg rgn rgo rgr rnb rng rnn rno rnr rnu rob rog ron roo ror rou rrb rrg rrn rrr rru rub rug run ruo rur ruu ubb ubg ubn ubo ubr ubu ugb ugg ugn ugo ugr ugu un- unb ung unn uno unr unu uob uog uon uoo uor ur- urb urg urn uro urr uru uug uun uur uuu