-er bbb bbe bbi bbk bbr bbt be- beb bee bei bek ber bet bev bi- bib bie bii bik bir bit biv bkb bke bkk bkr bkt bkv brb bre bri brk brr brt brv btb bte bti btk btr btt btv bvb bve bvi bvk bvr bvt bvv ebb ebe ebi ebk ebr ebt ebv eeb eee eek eer eet eev eib eie eii eik eir eit eiv ekb eke eki ekr ekt ekv erb ere eri erk err ert erv etb ete eti etk etr ett etv evb eve evi evr evt evv i-v ibb ibe ibi ibk ibr ibt ibv ie- iee iei iek ier iet iev iib iie iii iir iit ikb ike iki ikk ikr ikt ikv ir- irb ire iri irk irr irt irv itb ite iti itk itt itv ivb ive ivi ivr ivt ivv k-t kbb kbe kbi kbk kbr ke- keb kee kei kek ker ket kev kib kie kii kik kir kit kiv kkb kke kki kkk kkr kkt kkv kri krk krr krt krv ktb kte ktk ktr ktt ktv kvb kvi kvk kvr kvv rbb rbe rbi rbk rbr rbt re- reb ree rei rek rer ret rev rib rie rii rik rir rit riv rkb rke rkk rkt rkv rrb rri rrk rrr rrt rtb rte rti rtk rtr rtt rtv rvb rve rvi rvr rvt rvv tbb tbe tbi tbk tbr tbt tbv te- teb tee tei tek ter tet tev tib tie tii tik tir tit tiv tkb tke tkk tkr tkt trb tre tri trk trr trt trv ttb tte tti ttk ttr ttt ttv tvb tve tvi tvk tvr tvt v-e vbi vbk vbr vbv veb vee vei vek ver vet vi- vib vie vii vik vir vit viv vkb vkt vrb vre vri vrk vrr vrt vtb vte vti vtk vtr vtt vtv vvb vvi vvr vvt vvv