-ol bbb bbf bbi bbl bbn bbo bbs bfb bff bfi bfl bfn bfo bfs bi- bib bif bii bil bin bio bis blb blf bli bll bln blo bls bnb bnf bni bnl bnn bno bns bob bof boi bol bon boo bos bsb bsf bsi bsl bsn bso bss fbb fbf fbi fbl fbn fbo fbs fff ffi ffl ffn ffo ffs fib fif fii fil fin fis flb flf fli fll fln flo fls fnb fnf fni fnl fnn fns fob fof foi fol fon foo fos fsb fsf fsi fsl fsn fso fss i-f ibb ibf ibi ibl ibn ibo ibs ifb iff ifi ifl ifn ifo ifs iib iif iii iil iin iio iis il- ilb ilf ili ill iln ilo ils in- inb inf ini inl inn ino ins io- iob iof ioi iol ion ioo ios is- isb isf isi isl isn iso iss lbb lbf lbi lbl lbo lbs lfb lff lfi lfl lfn lfo lfs lib lif lii lil lin lio lis llb llf lli lll lln llo lls lnb lni lnl lnn lno lns lob lof loi lol lon loo los lsb lsf lsi lsl lsn lso lss n-i nbb nbf nbi nbl nbn nbo nbs nfb nff nfi nfl nfn nfo nfs nib nif nii nil nin nio nis nlb nlf nli nll nln nlo nls nnb nnf nni nnl nnn nno nns no- nob nof noi nol non noo nos nsb nsf nsi nsl nsn nso nss o-i ob- obb obf obi obl obn obo obs of- ofb off ofi ofl ofn ofo ofs oib oif oii oil oin oio ois olb olf oli oll oln olo ols on- onb onf oni onl onn ono ons oo- oob oof ooi ool oon ooo oos os- osb osf osi osl osn oso oss sbb sbf sbi sbl sbn sbo sbs sfb sff sfi sfl sfn sfo sfs sib sif sii sil sin sio sis slb slf sli sll sln slo sls snb snf sni snl snn sno sns sob sof soi sol son soo sos ss- ssb ssf ssi ssl ssn sso sss