-er bbb bbe bbg bbi bbk bbn bbo bbr be- beb bee beg bei bek ben beo ber bgb bge bgg bgi bgk bgn bgo bgr bi- bib bie big bii bik bin bio bir bkb bke bkg bkk bkn bko bkr bnb bne bng bni bnk bnn bno bnr bob boe bog boi bok bon boo bor brb bre brg bri brk brn bro brr ebb ebe ebg ebi ebk ebn ebo ebr eeb eee eeg eek een eeo eer egb ege egg egi egn ego egr eib eie eig eii eik ein eio eir ekb eke ekg eki eko ekr en- enb ene eng eni enk enn eno enr eo- eob eoe eog eoi eok eon eoo eor erb ere erg eri erk ern ero err gbe gbg gbi gbk gbn gbo gbr ge- geb gee geg gei gek gen geo ger ggb ggg ggi ggn ggo ggr gib gie gig gii gik gin gio gir gkb gkn gko gnb gne gni gnn gno gnr gob goe gog goi gok gon goo gor grb gre grg gri grk grn gro grr ibb ibe ibg ibi ibk ibn ibo ibr ie- iee ieg iei iek ien ier igb ige igg igi igk ign igo igr iib iie iii iin iio iir ikb ike iki ikk iko ikr in- inb ine ing ini ink inn ino inr io- iob ioe iog ioi ion ioo ior ir- irb ire irg iri irk irn iro irr kbb kbe kbi kbk kbn kbo kbr ke- keb kee keg kei kek ken keo ker kgb kgi kgo kib kie kig kii kik kin kio kir kkb kke kki kkk kkn kkr kn- kne kng kni knk knn kno knr kob koe kog koi kok kon koo kor krg kri krk krn kro krr n-i nbb nbe nbg nbi nbk nbn nbo nbr ne- neb nee neg nei nek nen neo ner ngb nge ngg ngi ngk ngn ngo nib nie nig nii nik nin nio nir nke nki nkk nkn nko nkr nnb nne nng nni nnk nnn nno no- nob noe nog noi nok non noo nor nrb nre nrg nri nrk nrn nro nrr o-i ob- obb obe obg obi obk obn obo obr oeb oee oeg oei oen oeo oer oge ogg ogi ogn ogo oib oie oii oik oin oio oir okb oke okg oki okk oko okr on- onb one ong oni onk onn ono onr oo- oob oog ooi ook oon ooo oor or- orb ore org ori ork orn oro orr rbb rbe rbg rbi rbk rbn rbo rbr re- reb ree reg rei rek ren reo rer rgb rge rgg rgi rgk rgn rgo rgr rib rie rig rii rik rin rio rir rkb rke rkg rkk rko rnb rng rni rnn rno rnr rob roe rog roi rok ron roo ror rrb rrg rri rrk rrn rrr