-er bbb bbe bbi bbk bbr bbt be- beb bee bei bek ber bet bi- bib bie bii bik bir bit bkb bke bkk bkr bkt brb bre bri brk brr brt btb bte bti btk btr btt ebb ebe ebi ebk ebr ebt eeb eee eek eer eet eib eie eii eik eir eit ekb eke eki ekr ekt erb ere eri erk err ert etb ete eti etk etr ett ibb ibe ibi ibk ibr ibt ie- iee iei iek ier iet iib iie iii iir iit ikb ike iki ikk ikr ikt ir- irb ire iri irk irr irt itb ite iti itk itt k-t kbb kbe kbi kbk kbr ke- keb kee kei kek ker ket kib kie kii kik kir kit kkb kke kki kkk kkr kkt kri krk krr krt ktb kte ktk ktr ktt rbb rbe rbi rbk rbr rbt re- reb ree rei rek rer ret rib rie rii rik rir rit rkb rke rkk rkt rrb rri rrk rrr rrt rtb rte rti rtk rtr rtt tbb tbe tbi tbk tbr tbt te- teb tee tei tek ter tet tib tie tii tik tir tit tkb tke tkk tkr tkt trb tre tri trk trr trt ttb tte tti ttk ttr ttt