-er b-u bbb bbe bbg bbi bbr bbu be- beb bee beg bei ber beu bgb bge bgg bgi bgr bgu bi- bib bie big bii bir biu brb bre brg bri brr bru bub bue bug bui bur buu ebb ebe ebg ebi ebr ebu eeb eee eeg eer egb ege egg egi egr egu eib eie eig eii eir eiu erb ere erg eri err eru eu- eub eue eug eui eur gbe gbg gbi gbr gbu ge- geb gee geg gei ger geu ggb ggg ggi ggr ggu gib gie gig gii gir giu grb gre grg gri grr gru gu- gub gue gug gui gur guu ibb ibe ibg ibi ibr ibu ie- iee ieg iei ier igb ige igg igi igr igu iib iie iii iir iiu ir- irb ire irg iri irr iru iu- iub iue iug iui iur rbb rbe rbg rbi rbr rbu re- reb ree reg rei rer reu rgb rge rgg rgi rgr rib rie rig rii rir rrb rrg rri rrr rru rub rue rug rui rur ruu ubb ube ubg ubi ubr ubu ueb uee ueg uei uer ugb uge ugg ugi ugr ugu uib uie uig uii uir uiu ur- urb ure urg uri urr uru uue uug uur uuu