bbb bbf bbi bbn bbo bbs bfb bff bfi bfn bfo bfs bi- bib bif bii bin bio bis bnb bnf bni bnn bno bns bob bof boi bon boo bos bsb bsf bsi bsn bso bss fbb fbf fbi fbn fbo fbs fff ffi ffn ffo ffs fib fif fii fin fis fnb fnf fni fnn fns fob fof foi fon foo fos fsb fsf fsi fsn fso fss i-f ibb ibf ibi ibn ibo ibs ifb iff ifi ifn ifo ifs iib iif iii iin iio iis in- inb inf ini inn ino ins io- iob iof ioi ion ioo ios is- isb isf isi isn iso iss n-i nbb nbf nbi nbn nbo nbs nfb nff nfi nfn nfo nfs nib nif nii nin nio nis nnb nnf nni nnn nno nns no- nob nof noi non noo nos nsb nsf nsi nsn nso nss o-i ob- obb obf obi obn obo obs of- ofb off ofi ofn ofo ofs oib oif oii oin oio ois on- onb onf oni onn ono ons oo- oob oof ooi oon ooo oos os- osb osf osi osn oso oss sbb sbf sbi sbn sbo sbs sfb sff sfi sfn sfo sfs sib sif sii sin sio sis snb snf sni snn sno sns sob sof soi son soo sos ss- ssb ssf ssi ssn sso sss