-er b-p bbb bbe bbi bbn bbo bbp bbr be- beb bee bei ben beo bep ber bi- bib bie bii bin bio bip bir bnb bne bni bnn bno bnp bnr bob boe boi bon boo bop bor bpb bpe bpi bpn bpo bpp bpr brb bre bri brn bro brp brr ebb ebe ebi ebn ebo ebp ebr eeb eee een eeo eep eer eib eie eii ein eio eip eir en- enb ene eni enn eno enp enr eo- eob eoe eoi eon eoo eop eor ep- epb epe epi epn epo epp epr erb ere eri ern ero erp err ibb ibe ibi ibn ibo ibp ibr ie- iee iei ien iep ier iib iie iii iin iio iip iir in- inb ine ini inn ino inp inr io- iob ioe ioi ion ioo iop ior ipb ipe ipi ipn ipo ipp ipr ir- irb ire iri irn iro irp irr n-i nbb nbe nbi nbn nbo nbp nbr ne- neb nee nei nen neo nep ner nib nie nii nin nio nip nir nnb nne nni nnn nno nnp no- nob noe noi non noo nop nor npb npe npi npn npo npp npr nrb nre nri nrn nro nrp nrr o-i ob- obb obe obi obn obo obp obr oeb oee oei oen oeo oep oer oib oie oii oin oio oip oir on- onb one oni onn ono onp onr oo- oob ooi oon ooo oop oor op- opb ope opi opn opo opp opr or- orb ore ori orn oro orp orr p-p pbb pbe pbi pbn pbo pbp pbr peb pee pei pen peo pep per pib pie pii pin pio pip pir pn- pnb pne pni pnn pno pnp pnr pob poe poi pon poo pop por ppb ppe ppi ppn ppo ppp ppr prb pre pri prn pro prp prr rbb rbe rbi rbn rbo rbp rbr re- reb ree rei ren reo rep rer rib rie rii rin rio rip rir rnb rni rnn rno rnp rnr rob roe roi ron roo rop ror rpb rpe rpi rpn rpo rpp rpr rrb rri rrn rrp rrr