bbb bbe bbf bbi bbs bbt be- beb bee bef bei bes bet bfb bfe bff bfi bfs bft bi- bib bie bif bii bis bit bsb bse bsf bsi bss bst btb bte btf bti bts btt ebb ebe ebf ebi ebs ebt eeb eee eef ees eet ef- efb efe eff efi efs eft eib eie eif eii eis eit es- esb ese esf esi ess est etb ete etf eti ets ett fbb fbe fbf fbi fbs fbt feb fee fef fei fes fet ffe fff ffi ffs fft fib fie fif fii fis fit fsb fse fsf fsi fss fst ftb fte ftf fti fts ftt i-f ibb ibe ibf ibi ibs ibt ie- iee ief iei ies iet ifb ife iff ifi ifs ift iib iie iif iii iis iit is- isb ise isf isi iss ist itb ite itf iti its itt sbb sbe sbf sbi sbs sbt se- seb see sef sei ses set sfb sfe sff sfi sfs sft sib sie sif sii sis sit ss- ssb sse ssf ssi sss sst stb ste stf sti sts stt tbb tbe tbf tbi tbs tbt te- teb tee tef tei tes tet tfb tfe tff tfi tfs tft tib tie tif tii tis tit tsb tse tsf tsi tss tst ttb tte ttf tti tts ttt