bbb bbf bbg bbi bbn bbo bbr bbs bfb bff bfg bfi bfn bfo bfr bfs bgb bgf bgg bgi bgn bgo bgr bgs bi- bib bif big bii bin bio bir bis bnb bnf bng bni bnn bno bnr bns bob bof bog boi bon boo bor bos brb brf brg bri brn bro brr brs bsb bsf bsg bsi bsn bso bsr bss fbb fbf fbg fbi fbn fbo fbr fbs fff ffg ffi ffn ffo ffr ffs fgb fgf fgg fgi fgn fgr fgs fib fif fig fii fin fir fis fnb fnf fng fni fnn fnr fns fob fof fog foi fon foo for fos frb frf frg fri frn fro frr frs fsb fsf fsg fsi fsn fso fsr fss gbf gbg gbi gbn gbo gbr gbs gfb gff gfi gfo gfr gfs ggb ggg ggi ggn ggo ggr ggs gib gif gig gii gin gio gir gis gnb gnf gni gnn gno gnr gns gob gof gog goi gon goo gor gos grb grf grg gri grn gro grr grs gsb gsf gsg gsi gsn gso gsr gss i-f ibb ibf ibg ibi ibn ibo ibr ibs ifb iff ifg ifi ifn ifo ifr ifs igb igf igg igi ign igo igr igs iib iif iii iin iio iir iis in- inb inf ing ini inn ino inr ins io- iob iof iog ioi ion ioo ior ios ir- irb irf irg iri irn iro irr irs is- isb isf isg isi isn iso isr iss n-i nbb nbf nbg nbi nbn nbo nbr nbs nfb nff nfi nfn nfo nfr nfs ngb ngf ngg ngi ngn ngo ngs nib nif nig nii nin nio nir nis nnb nnf nng nni nnn nno nns no- nob nof nog noi non noo nor nos nrb nrf nrg nri nrn nro nrr nrs nsb nsf nsg nsi nsn nso nsr nss o-i ob- obb obf obg obi obn obo obr obs of- ofb off ofg ofi ofn ofo ofr ofs ogf ogg ogi ogn ogo ogs oib oif oii oin oio oir ois on- onb onf ong oni onn ono onr ons oo- oob oof oog ooi oon ooo oor oos or- orb orf org ori orn oro orr ors os- osb osf osg osi osn oso osr oss rbb rbf rbg rbi rbn rbo rbr rbs rfb rff rfg rfi rfn rfo rfr rfs rgb rgf rgg rgi rgn rgo rgr rgs rib rif rig rii rin rio rir ris rnb rng rni rnn rno rnr rns rob rof rog roi ron roo ror ros rrb rrf rrg rri rrn rrr rrs rsb rsf rsg rsi rsn rso rsr rss sbb sbf sbg sbi sbn sbo sbr sbs sfb sff sfg sfi sfn sfo sfr sfs sgb sgf sgg sgi sgn sgo sgr sgs sib sif sig sii sin sio sir sis snb snf sng sni snn sno snr sns sob sof sog soi son soo sor sos sr- srb srf srg sri srn sro srr srs ss- ssb ssf ssg ssi ssn sso ssr sss