-er bbb bbe bbg bbr bbt be- beb bee beg ber bet bez bgb bge bgg bgr bgt bgz brb bre brg brr brt brz btb bte btg btr btt btz bze bzr bzz ebb ebe ebg ebr ebt eeb eee eeg eer eet egb ege egg egr egt erb ere erg err ert erz etb ete etg etr ett etz eze ezr ezz gbe gbg gbr gbt gbz ge- geb gee geg ger get gez ggb ggg ggr ggt ggz grb gre grg grr grt gtb gte gtg gtr gtt gzr rbb rbe rbg rbr rbt re- reb ree reg rer ret rez rgb rge rgg rgr rgt rrb rrg rrr rrt rtb rte rtg rtr rtt rtz rzb rze tbb tbe tbg tbr tbt tbz te- teb tee teg ter tet tez tgb tge tgg tgr tgt tgz trb tre trg trr trt trz ttb tte ttg ttr ttt tze z-g zbb zbr zbt zeb zee zer zet zez zgb zgg zte ztr zzr zzt zzz