-er -up b-p b-u bbb bbe bbi bbn bbp bbr bbu be- beb bee bei ben bep ber beu bi- bib bie bii bin bip bir biu bnb bne bni bnn bnp bnr bnu bpb bpe bpi bpn bpp bpr bpu brb bre bri brn brp brr bru bub bue bui bun bup bur buu ebb ebe ebi ebn ebp ebr ebu eeb eee een eep eer eib eie eii ein eip eir eiu en- enb ene eni enn enp enr enu ep- epb epe epi epn epp epr epu erb ere eri ern erp err eru eu- eub eue eui eun eup eur ibb ibe ibi ibn ibp ibr ibu ie- iee iei ien iep ier iib iie iii iin iip iir iiu in- inb ine ini inn inp inr inu ipb ipe ipi ipn ipp ipr ipu ir- irb ire iri irn irp irr iru iu- iub iue iui iup iur n-i nbb nbe nbi nbn nbp nbr nbu ne- neb nee nei nen nep ner neu nib nie nii nin nip nir niu nnb nne nni nnn nnp nnu npb npe npi npn npp npr npu nrb nre nri nrn nrp nrr nru nub nue nui nun nup nur nuu p-p pbb pbe pbi pbn pbp pbr pbu peb pee pei pen pep per peu pib pie pii pin pip pir piu pn- pnb pne pni pnn pnp pnr pnu ppb ppe ppi ppn ppp ppr ppu prb pre pri prn prp prr pru pub pue pui pun pup pur puu rbb rbe rbi rbn rbp rbr rbu re- reb ree rei ren rep rer reu rib rie rii rin rip rir rnb rni rnn rnp rnr rnu rpb rpe rpi rpn rpp rpr rpu rrb rri rrn rrp rrr rru rub rue rui run rup rur ruu ubb ube ubi ubn ubp ubr ubu ueb uee uei uen uep uer uib uie uii uin uip uir uiu un- unb une uni unn unp unr unu up- upb upe upi upn upp upr upu ur- urb ure uri urn urp urr uru uue uun uur uuu