-er -up b-p b-u bbb bbe bbi bbn bbo bbp bbr bbu be- beb bee bei ben beo bep ber beu bi- bib bie bii bin bio bip bir biu bnb bne bni bnn bno bnp bnr bnu bob boe boi bon boo bop bor bou bpb bpe bpi bpn bpo bpp bpr bpu brb bre bri brn bro brp brr bru bub bue bui bun buo bup bur buu ebb ebe ebi ebn ebo ebp ebr ebu eeb eee een eeo eep eer eib eie eii ein eio eip eir eiu en- enb ene eni enn eno enp enr enu eo- eob eoe eoi eon eoo eop eor eou ep- epb epe epi epn epo epp epr epu erb ere eri ern ero erp err eru eu- eub eue eui eun eup eur ibb ibe ibi ibn ibo ibp ibr ibu ie- iee iei ien iep ier iib iie iii iin iio iip iir iiu in- inb ine ini inn ino inp inr inu io- iob ioe ioi ion ioo iop ior iou ipb ipe ipi ipn ipo ipp ipr ipu ir- irb ire iri irn iro irp irr iru iu- iub iue iui iup iur n-i nbb nbe nbi nbn nbo nbp nbr nbu ne- neb nee nei nen neo nep ner neu nib nie nii nin nio nip nir niu nnb nne nni nnn nno nnp nnu no- nob noe noi non noo nop nor nou npb npe npi npn npo npp npr npu nrb nre nri nrn nro nrp nrr nru nub nue nui nun nuo nup nur nuu o-i ob- obb obe obi obn obo obp obr obu oeb oee oei oen oeo oep oer oib oie oii oin oio oip oir oiu on- onb one oni onn ono onp onr onu oo- oob ooi oon ooo oop oor op- opb ope opi opn opo opp opr or- orb ore ori orn oro orp orr oru ou- oue oui oun ouo oup our p-p pbb pbe pbi pbn pbo pbp pbr pbu peb pee pei pen peo pep per peu pib pie pii pin pio pip pir piu pn- pnb pne pni pnn pno pnp pnr pnu pob poe poi pon poo pop por pou ppb ppe ppi ppn ppo ppp ppr ppu prb pre pri prn pro prp prr pru pub pue pui pun pup pur puu rbb rbe rbi rbn rbo rbp rbr rbu re- reb ree rei ren reo rep rer reu rib rie rii rin rio rip rir rnb rni rnn rno rnp rnr rnu rob roe roi ron roo rop ror rou rpb rpe rpi rpn rpo rpp rpr rpu rrb rri rrn rrp rrr rru rub rue rui run ruo rup rur ruu ubb ube ubi ubn ubo ubp ubr ubu ueb uee uei uen uep uer uib uie uii uin uio uip uir uiu un- unb une uni unn uno unp unr unu uob uoe uon uoo uop uor up- upb upe upi upn upo upp upr upu ur- urb ure uri urn uro urp urr uru uue uun uur uuu