-er bbb bbe bbg bbi bbr be- beb bee beg bei ber bgb bge bgg bgi bgr bi- bib bie big bii bir brb bre brg bri brr ebb ebe ebg ebi ebr eeb eee eeg eer egb ege egg egi egr eib eie eig eii eir erb ere erg eri err gbe gbg gbi gbr ge- geb gee geg gei ger ggb ggg ggi ggr gib gie gig gii gir grb gre grg gri grr ibb ibe ibg ibi ibr ie- iee ieg iei ier igb ige igg igi igr iib iie iii iir ir- irb ire irg iri irr rbb rbe rbg rbi rbr re- reb ree reg rei rer rgb rge rgg rgi rgr rib rie rig rii rir rrb rrg rri rrr