bbb bbf bbi bbl bbt bfb bff bfi bfl bft bi- bib bif bii bil bit blb blf bli bll blt btb btf bti btl btt fbb fbf fbi fbl fbt fff ffi ffl fft fib fif fii fil fit flb flf fli fll flt ftb ftf fti ftl ftt i-f ibb ibf ibi ibl ibt ifb iff ifi ifl ift iib iif iii iil iit il- ilb ilf ili ill ilt itb itf iti itl itt lbb lbf lbi lbl lbt lfb lff lfi lfl lft lib lif lii lil lit llb llf lli lll llt ltb ltf lti ltl ltt tbb tbf tbi tbl tbt tfb tff tfi tfl tft tib tif tii til tit tlf tli tll tlt ttb ttf tti ttl ttt