bbb bbf bbi bbn bbs bfb bff bfi bfn bfs bi- bib bif bii bin bis bnb bnf bni bnn bns bsb bsf bsi bsn bss fbb fbf fbi fbn fbs fff ffi ffn ffs fib fif fii fin fis fnb fnf fni fnn fns fsb fsf fsi fsn fss i-f ibb ibf ibi ibn ibs ifb iff ifi ifn ifs iib iif iii iin iis in- inb inf ini inn ins is- isb isf isi isn iss n-i nbb nbf nbi nbn nbs nfb nff nfi nfn nfs nib nif nii nin nis nnb nnf nni nnn nns nsb nsf nsi nsn nss sbb sbf sbi sbn sbs sfb sff sfi sfn sfs sib sif sii sin sis snb snf sni snn sns ss- ssb ssf ssi ssn sss