-er bbb bbe bbg bbi bbo bbr be- beb bee beg bei beo ber bgb bge bgg bgi bgo bgr bi- bib bie big bii bio bir bob boe bog boi boo bor brb bre brg bri bro brr 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 gbe gbg gbi gbo gbr ge- geb gee geg gei geo ger ggb ggg ggi ggo ggr gib gie gig gii gio gir gob goe gog goi goo gor grb gre grg gri gro grr ibb ibe ibg ibi ibo ibr 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 o-i ob- obb obe obg obi obo obr oeb oee oeg oei oeo oer oge ogg ogi ogo oib oie oii oio oir oo- oob oog ooi ooo oor or- orb ore org ori oro orr rbb rbe rbg rbi rbo rbr re- reb ree reg rei reo rer rgb rge rgg rgi rgo rgr rib rie rig rii rio rir rob roe rog roi roo ror rrb rrg rri rrr