-er bbb bbe bbi bbk bbl bbr bbt be- beb bee bei bek bel ber bet bi- bib bie bii bik bil bir bit bkb bke bkk bkl bkr bkt blb ble bli blk bll blr blt brb bre bri brk brl brr brt btb bte bti btk btl btr btt ebb ebe ebi ebk ebl ebr ebt eeb eee eek eel eer eet eib eie eii eik eil eir eit ekb eke eki ekl ekr ekt elb ele eli elk ell elr elt erb ere eri erk erl err ert etb ete eti etk etl etr ett ibb ibe ibi ibk ibl ibr ibt ie- iee iei iek iel ier iet iib iie iii iil iir iit ikb ike iki ikk ikl ikr ikt il- ilb ile ili ilk ill ilr ilt ir- irb ire iri irk irl irr irt itb ite iti itk itl itt k-t kbb kbe kbi kbk kbl kbr ke- keb kee kei kek kel ker ket kib kie kii kik kil kir kit kkb kke kki kkk kkl kkr kkt kl- klb kli klr klt kri krk krl krr krt ktb kte ktk ktl ktr ktt lbb lbe lbi lbk lbl lbr lbt leb lee lei lek lel ler let lib lie lii lik lil lir lit lkb lkl lkr lkt llb lle lli llk lll llr llt lrb lri lrk lrr lrt ltb lte lti ltk ltl ltr ltt rbb rbe rbi rbk rbl rbr rbt re- reb ree rei rek rel rer ret rib rie rii rik ril rir rit rkb rke rkk rkt rle rli rll rlr rlt rrb rri rrk rrl rrr rrt rtb rte rti rtk rtl rtr rtt tbb tbe tbi tbk tbl tbr tbt te- teb tee tei tek tel ter tet tib tie tii tik til tir tit tkb tke tkk tkl tkr tkt tle tli tlk tll tlr tlt trb tre tri trk trl trr trt ttb tte tti ttk ttl ttr ttt