-er bbb bbe bbg bbi bbk bbr be- beb bee beg bei bek ber bgb bge bgg bgi bgk bgr bi- bib bie big bii bik bir bkb bke bkg bkk bkr brb bre brg bri brk brr ebb ebe ebg ebi ebk ebr eeb eee eeg eek eer egb ege egg egi egr eib eie eig eii eik eir ekb eke ekg eki ekr erb ere erg eri erk err gbe gbg gbi gbk gbr ge- geb gee geg gei gek ger ggb ggg ggi ggr gib gie gig gii gik gir gkb grb gre grg gri grk grr ibb ibe ibg ibi ibk ibr ie- iee ieg iei iek ier igb ige igg igi igk igr iib iie iii iir ikb ike iki ikk ikr ir- irb ire irg iri irk irr kbb kbe kbi kbk kbr ke- keb kee keg kei kek ker kgb kgi kib kie kig kii kik kir kkb kke kki kkk kkr krg kri krk krr rbb rbe rbg rbi rbk rbr re- reb ree reg rei rek rer rgb rge rgg rgi rgk rgr rib rie rig rii rik rir rkb rke rkg rkk rrb rrg rri rrk rrr