-er bbb bbe bbf bbg bbi bbk bbn bbo bbr be- beb bee bef beg bei bek ben beo ber bfb bfe bff bfg bfi bfn bfo bfr bgb bge bgf bgg bgi bgk bgn bgo bgr bi- bib bie bif big bii bik bin bio bir bkb bke bkf bkg bkk bkn bko bkr bnb bne bnf bng bni bnk bnn bno bnr bob boe bof bog boi bok bon boo bor brb bre brf brg bri brk brn bro brr ebb ebe ebf ebg ebi ebk ebn ebo ebr eeb eee eef eeg eek een eeo eer ef- efb efe eff efg efi efo efr egb ege egf egg egi egn ego egr eib eie eif eig eii eik ein eio eir ekb eke ekf ekg eki eko ekr en- enb ene enf eng eni enk enn eno enr eo- eob eoe eof eog eoi eok eon eoo eor erb ere erf erg eri erk ern ero err fbb fbe fbf fbg fbi fbk fbn fbo fbr feb fee fef feg fei fek fen feo fer ffe fff ffg ffi ffk ffn ffo ffr fgb fge fgf fgg fgi fgn fgr fib fie fif fig fii fik fin fir fkb fkf fkg fki fkk fnb fne fnf fng fni fnk fnn fnr fob foe fof fog foi fok fon foo for frb fre frf frg fri frk frn fro frr gbe gbf gbg gbi gbk gbn gbo gbr ge- geb gee gef geg gei gek gen geo ger gfb gfe gff gfi gfk gfo gfr ggb ggg ggi ggn ggo ggr gib gie gif gig gii gik gin gio gir gkb gkn gko gnb gne gnf gni gnn gno gnr gob goe gof gog goi gok gon goo gor grb gre grf grg gri grk grn gro grr i-f ibb ibe ibf ibg ibi ibk ibn ibo ibr ie- iee ief ieg iei iek ien ier ifb ife iff ifg ifi ifn ifo ifr igb ige igf igg igi igk ign igo igr iib iie iif iii iin iio iir ikb ike ikf iki ikk iko ikr in- inb ine inf ing ini ink inn ino inr io- iob ioe iof iog ioi ion ioo ior ir- irb ire irf irg iri irk irn iro irr kbb kbe kbf kbi kbk kbn kbo kbr ke- keb kee kef keg kei kek ken keo ker kff kfg kfi kfo kgb kgf kgi kgo kib kie kif kig kii kik kin kio kir kkb kke kki kkk kkn kkr kn- kne knf kng kni knk knn kno knr kob koe kof kog koi kok kon koo kor krf krg kri krk krn kro krr n-i nbb nbe nbf nbg nbi nbk nbn nbo nbr ne- neb nee nef neg nei nek nen neo ner nfb nfe nff nfi nfk nfn nfo nfr ngb nge ngf ngg ngi ngk ngn ngo nib nie nif nig nii nik nin nio nir nke nkf nki nkk nkn nko nkr nnb nne nnf nng nni nnk nnn nno no- nob noe nof nog noi nok non noo nor nrb nre nrf nrg nri nrk nrn nro nrr o-i ob- obb obe obf obg obi obk obn obo obr oeb oee oef oeg oei oen oeo oer of- ofb ofe off ofg ofi ofn ofo ofr oge ogf ogg ogi ogn ogo oib oie oif oii oik oin oio oir okb oke okg oki okk oko okr on- onb one onf ong oni onk onn ono onr oo- oob oof oog ooi ook oon ooo oor or- orb ore orf org ori ork orn oro orr rbb rbe rbf rbg rbi rbk rbn rbo rbr re- reb ree ref reg rei rek ren reo rer rfb rfe rff rfg rfi rfk rfn rfo rfr rgb rge rgf rgg rgi rgk rgn rgo rgr rib rie rif rig rii rik rin rio rir rkb rke rkf rkg rkk rko rnb rng rni rnn rno rnr rob roe rof rog roi rok ron roo ror rrb rrf rrg rri rrk rrn rrr