-er bbb bbe bbg bbi bbk bbr bbt be- beb bee beg bei bek ber bet bgb bge bgg bgi bgk bgr bgt bi- bib bie big bii bik bir bit bkb bke bkg bkk bkr bkt brb bre brg bri brk brr brt btb bte btg bti btk btr btt ebb ebe ebg ebi ebk ebr ebt eeb eee eeg eek eer eet egb ege egg egi egr egt eib eie eig eii eik eir eit ekb eke ekg eki ekr ekt erb ere erg eri erk err ert etb ete etg eti etk etr ett gbe gbg gbi gbk gbr gbt ge- geb gee geg gei gek ger get ggb ggg ggi ggr ggt gib gie gig gii gik gir git gkb gkt grb gre grg gri grk grr grt gtb gte gtg gti gtk gtr gtt ibb ibe ibg ibi ibk ibr ibt ie- iee ieg iei iek ier iet igb ige igg igi igk igr igt iib iie iii iir iit ikb ike iki ikk ikr ikt ir- irb ire irg iri irk irr irt itb ite itg iti itk itt k-t kbb kbe kbi kbk kbr ke- keb kee keg kei kek ker ket kgb kgi kib kie kig kii kik kir kit kkb kke kki kkk kkr kkt krg kri krk krr krt ktb kte ktg ktk ktr ktt rbb rbe rbg rbi rbk rbr rbt re- reb ree reg rei rek rer ret rgb rge rgg rgi rgk rgr rgt rib rie rig rii rik rir rit rkb rke rkg rkk rkt rrb rrg rri rrk rrr rrt rtb rte rtg rti rtk rtr rtt tbb tbe tbg tbi tbk tbr tbt te- teb tee teg tei tek ter tet tgb tge tgg tgi tgk tgr tgt tib tie tig tii tik tir tit tkb tke tkg tkk tkr tkt trb tre trg tri trk trr trt ttb tte ttg tti ttk ttr ttt