-er b-p bbb bbe bbi bbn bbp bbr be- beb bee bei ben bep ber bi- bib bie bii bin bip bir bnb bne bni bnn bnp bnr bpb bpe bpi bpn bpp bpr brb bre bri brn brp brr ebb ebe ebi ebn ebp ebr eeb eee een eep eer eib eie eii ein eip eir en- enb ene eni enn enp enr ep- epb epe epi epn epp epr erb ere eri ern erp err ibb ibe ibi ibn ibp ibr ie- iee iei ien iep ier iib iie iii iin iip iir in- inb ine ini inn inp inr ipb ipe ipi ipn ipp ipr ir- irb ire iri irn irp irr n-i nbb nbe nbi nbn nbp nbr ne- neb nee nei nen nep ner nib nie nii nin nip nir nnb nne nni nnn nnp npb npe npi npn npp npr nrb nre nri nrn nrp nrr p-p pbb pbe pbi pbn pbp pbr peb pee pei pen pep per pib pie pii pin pip pir pn- pnb pne pni pnn pnp pnr ppb ppe ppi ppn ppp ppr prb pre pri prn prp prr rbb rbe rbi rbn rbp rbr re- reb ree rei ren rep rer rib rie rii rin rip rir rnb rni rnn rnp rnr rpb rpe rpi rpn rpp rpr rrb rri rrn rrp rrr