-er bbb bbe bbg bbi bbr bbt be- beb bee beg bei ber bet bgb bge bgg bgi bgr bgt bi- bib bie big bii bir bit brb bre brg bri brr brt btb bte btg bti btr btt ebb ebe ebg ebi ebr ebt eeb eee eeg eer eet egb ege egg egi egr egt eib eie eig eii eir eit erb ere erg eri err ert etb ete etg eti etr ett gbe gbg gbi gbr gbt ge- geb gee geg gei ger get ggb ggg ggi ggr ggt gib gie gig gii gir git grb gre grg gri grr grt gtb gte gtg gti gtr gtt ibb ibe ibg ibi ibr ibt ie- iee ieg iei ier iet igb ige igg igi igr igt iib iie iii iir iit ir- irb ire irg iri irr irt itb ite itg iti itt rbb rbe rbg rbi rbr rbt re- reb ree reg rei rer ret rgb rge rgg rgi rgr rgt rib rie rig rii rir rit rrb rrg rri rrr rrt rtb rte rtg rti rtr rtt tbb tbe tbg tbi tbr tbt te- teb tee teg tei ter tet tgb tge tgg tgi tgr tgt tib tie tig tii tir tit trb tre trg tri trr trt ttb tte ttg tti ttr ttt