-er bbb bbe bbg bbi bbo bbr be- beb bee beg bei beo ber bez bgb bge bgg bgi bgo bgr bgz bi- bib bie big bii bio bir biz bob boe bog boi boo bor boz brb bre brg bri bro brr brz bze bzo bzr bzz ebb ebe ebg ebi ebo ebr eeb eee eeg eeo eer egb ege egg egi ego egr eib eie eig eii eio eir eo- eob eoe eog eoi eoo eor erb ere erg eri ero err erz eze ezo ezr ezz gbe gbg gbi gbo gbr gbz ge- geb gee geg gei geo ger gez ggb ggg ggi ggo ggr ggz gib gie gig gii gio gir giz gob goe gog goi goo gor goz grb gre grg gri gro grr gzo gzr ibb ibe ibg ibi ibo ibr ibz ie- iee ieg iei ier igb ige igg igi igo igr iib iie iii iio iir io- iob ioe iog ioi ioo ior ir- irb ire irg iri iro irr ize izi izo izz o-i ob- obb obe obg obi obo obr oeb oee oeg oei oeo oer oge ogg ogi ogo oib oie oii oio oir oiz oo- oob oog ooi ooo oor or- orb ore org ori oro orr orz oze ozo ozz rbb rbe rbg rbi rbo rbr re- reb ree reg rei reo rer rez rgb rge rgg rgi rgo rgr rib rie rig rii rio rir riz rob roe rog roi roo ror roz rrb rrg rri rrr rzb rze rzo z-g zbb zbr zeb zee zeo zer zez zgb zgg zgi zib zie zig zio zir ziz zo- zob zoe zog zoi zoo zor zro zzr zzz