b-u bbb bbf bbi bbl bbu bfb bff bfi bfl bfu bi- bib bif bii bil biu blb blf bli bll blu bub buf bui bul buu fbb fbf fbi fbl fbu fff ffi ffl ffu fib fif fii fil fiu flb flf fli fll flu fub fuf fui ful fuu i-f ibb ibf ibi ibl ibu ifb iff ifi ifl ifu iib iif iii iil iiu il- ilb ilf ili ill ilu iu- iub iui lbb lbf lbi lbl lbu lfb lff lfi lfl lfu lib lif lii lil liu llb llf lli lll llu lub luf lui lul luu ubb ubf ubi ubl ubu uff ufi ufl ufu uib uif uii uil uiu ulb ulf uli ull ulu uuu