bbb bbe bbf bbi bbt be- beb bee bef bei bet bfb bfe bff bfi bft bi- bib bie bif bii bit btb bte btf bti btt ebb ebe ebf ebi ebt eeb eee eef eet ef- efb efe eff efi eft eib eie eif eii eit etb ete etf eti ett fbb fbe fbf fbi fbt feb fee fef fei fet ffe fff ffi fft fib fie fif fii fit ftb fte ftf fti ftt i-f ibb ibe ibf ibi ibt ie- iee ief iei iet ifb ife iff ifi ift iib iie iif iii iit itb ite itf iti itt tbb tbe tbf tbi tbt te- teb tee tef tei tet tfb tfe tff tfi tft tib tie tif tii tit ttb tte ttf tti ttt