-er bbb bbe bbi bbk bbn bbr be- beb bee bei bek ben ber bev bi- bib bie bii bik bin bir biv bkb bke bkk bkn bkr bkv bnb bne bni bnk bnn bnr bnv brb bre bri brk brn brr brv bvb bve bvi bvk bvn bvr bvv ebb ebe ebi ebk ebn ebr ebv eeb eee eek een eer eev eib eie eii eik ein eir eiv ekb eke eki ekr ekv en- enb ene eni enk enn enr env erb ere eri erk ern err erv evb eve evi evn evr evv i-v ibb ibe ibi ibk ibn ibr ibv ie- iee iei iek ien ier iev iib iie iii iin iir ikb ike iki ikk ikr ikv in- inb ine ini ink inn inr inv ir- irb ire iri irk irn irr irv ivb ive ivi ivr ivv kbb kbe kbi kbk kbn kbr ke- keb kee kei kek ken ker kev kib kie kii kik kin kir kiv kkb kke kki kkk kkn kkr kkv kn- kne kni knk knn knr kri krk krn krr krv kvb kvi kvk kvn kvr kvv n-i nbb nbe nbi nbk nbn nbr nbv ne- neb nee nei nek nen ner nev nib nie nii nik nin nir niv nke nki nkk nkn nkr nnb nne nni nnk nnn nnv nrb nre nri nrk nrn nrr nrv nvb nve nvi nvk nvn nvv rbb rbe rbi rbk rbn rbr re- reb ree rei rek ren rer rev rib rie rii rik rin rir riv rkb rke rkk rkv rnb rni rnn rnr rnv rrb rri rrk rrn rrr rvb rve rvi rvn rvr rvv v-e vbi vbk vbr vbv veb vee vei vek ven ver vi- vib vie vii vik vin vir viv vkb vn- vni vnr vnv vrb vre vri vrk vrn vrr vvb vvi vvr vvv