bbb bbe bbf bbi bbs be- beb bee bef bei bes bfb bfe bff bfi bfs bi- bib bie bif bii bis bsb bse bsf bsi bss ebb ebe ebf ebi ebs eeb eee eef ees ef- efb efe eff efi efs eib eie eif eii eis es- esb ese esf esi ess fbb fbe fbf fbi fbs feb fee fef fei fes ffe fff ffi ffs fib fie fif fii fis fsb fse fsf fsi fss i-f ibb ibe ibf ibi ibs ie- iee ief iei ies ifb ife iff ifi ifs iib iie iif iii iis is- isb ise isf isi iss sbb sbe sbf sbi sbs se- seb see sef sei ses sfb sfe sff sfi sfs sib sie sif sii sis ss- ssb sse ssf ssi sss