-er bbb bbe bbg bbi bbr be- beb bee beg bei ber bez bgb bge bgg bgi bgr bgz bi- bib bie big bii bir biz brb bre brg bri brr brz bze bzr bzz ebb ebe ebg ebi ebr eeb eee eeg eer egb ege egg egi egr eib eie eig eii eir erb ere erg eri err erz eze ezr ezz gbe gbg gbi gbr gbz ge- geb gee geg gei ger gez ggb ggg ggi ggr ggz gib gie gig gii gir giz grb gre grg gri grr gzr ibb ibe ibg ibi ibr ibz ie- iee ieg iei ier igb ige igg igi igr iib iie iii iir ir- irb ire irg iri irr ize izi izz rbb rbe rbg rbi rbr re- reb ree reg rei rer rez rgb rge rgg rgi rgr rib rie rig rii rir riz rrb rrg rri rrr rzb rze z-g zbb zbr zeb zee zer zez zgb zgg zgi zib zie zig zir ziz zzr zzz