-er bbb bbe bbg bbo bbr bbt be- beb bee beg beo ber bet bez bgb bge bgg bgo bgr bgt bgz bob boe bog boo bor bot boz brb bre brg bro brr brt brz btb bte btg bto btr btt btz bze bzo bzr bzz ebb ebe ebg ebo ebr ebt eeb eee eeg eeo eer eet egb ege egg ego egr egt eo- eob eoe eog eoo eor eot erb ere erg ero err ert erz etb ete etg eto etr ett etz eze ezo ezr ezz gbe gbg gbo gbr gbt gbz ge- geb gee geg geo ger get gez ggb ggg ggo ggr ggt ggz gob goe gog goo gor got goz grb gre grg gro grr grt gtb gte gtg gto gtr gtt gzo gzr ob- obb obe obg obo obr obt oeb oee oeg oeo oer oet oge ogg ogo ogt oo- oob oog ooo oor oot or- orb ore org oro orr ort orz ot- otb ote otg oto otr ott otz oze ozo ozt ozz rbb rbe rbg rbo rbr rbt re- reb ree reg reo rer ret rez rgb rge rgg rgo rgr rgt rob roe rog roo ror rot roz rrb rrg rrr rrt rtb rte rtg rto rtr rtt rtz rzb rze rzo tbb tbe tbg tbo tbr tbt tbz te- teb tee teg teo ter tet tez tgb tge tgg tgo tgr tgt tgz to- tob toe tog too tor tot toz trb tre trg tro trr trt trz ttb tte ttg tto ttr ttt tze z-g zbb zbr zbt zeb zee zeo zer zet zez zgb zgg zo- zob zoe zog zoo zor zot zro zte ztr zzr zzt zzz