b-u bbb bbf bbi bbn bbu bfb bff bfi bfn bfu bi- bib bif bii bin biu bnb bnf bni bnn bnu bub buf bui bun buu fbb fbf fbi fbn fbu fff ffi ffn ffu fib fif fii fin fiu fnb fnf fni fnn fnu fub fuf fui fun fuu i-f ibb ibf ibi ibn ibu ifb iff ifi ifn ifu iib iif iii iin iiu in- inb inf ini inn inu iu- iub iui n-i nbb nbf nbi nbn nbu nfb nff nfi nfn nfu nib nif nii nin niu nnb nnf nni nnn nnu nub nui nun nuu ubb ubf ubi ubn ubu uff ufi ufn ufu uib uif uii uin uiu un- unb unf uni unn unu uun uuu