b-u bbb bbf bbi bbl bbt bbu bfb bff bfi bfl bft bfu bi- bib bif bii bil bit biu blb blf bli bll blt blu btb btf bti btl btt btu bub buf bui bul but buu fbb fbf fbi fbl fbt fbu fff ffi ffl fft ffu fib fif fii fil fit fiu flb flf fli fll flt flu ftb ftf fti ftl ftt ftu fub fuf fui ful fut fuu i-f ibb ibf ibi ibl ibt ibu ifb iff ifi ifl ift ifu iib iif iii iil iit iiu il- ilb ilf ili ill ilt ilu itb itf iti itl itt itu iu- iub iui iut lbb lbf lbi lbl lbt lbu lfb lff lfi lfl lft lfu lib lif lii lil lit liu llb llf lli lll llt llu ltb ltf lti ltl ltt ltu lub luf lui lul lut luu tbb tbf tbi tbl tbt tbu tfb tff tfi tfl tft tfu tib tif tii til tit tiu tlf tli tll tlt tlu ttb ttf tti ttl ttt ttu tub tuf tui tul tut tuu ubb ubf ubi ubl ubt ubu uff ufi ufl uft ufu uib uif uii uil uit uiu ulb ulf uli ull ult ulu utb utf uti utl utt utu uut uuu