-er bbb bbe bbg bbr bbt be- beb bee beg ber bet bgb bge bgg bgr bgt brb bre brg brr brt btb bte btg btr btt ebb ebe ebg ebr ebt eeb eee eeg eer eet egb ege egg egr egt erb ere erg err ert etb ete etg etr ett gbe gbg gbr gbt ge- geb gee geg ger get ggb ggg ggr ggt grb gre grg grr grt gtb gte gtg gtr gtt rbb rbe rbg rbr rbt re- reb ree reg rer ret rgb rge rgg rgr rgt rrb rrg rrr rrt rtb rte rtg rtr rtt tbb tbe tbg tbr tbt te- teb tee teg ter tet tgb tge tgg tgr tgt trb tre trg trr trt ttb tte ttg ttr ttt