-er b-p bbb bbe bbi bbn bbo bbp bbr bbs be- beb bee bei ben beo bep ber bes bi- bib bie bii bin bio bip bir bis bnb bne bni bnn bno bnp bnr bns bob boe boi bon boo bop bor bos bpb bpe bpi bpn bpo bpp bpr bps brb bre bri brn bro brp brr brs bsb bse bsi bsn bso bsp bsr bss ebb ebe ebi ebn ebo ebp ebr ebs eeb eee een eeo eep eer ees eib eie eii ein eio eip eir eis en- enb ene eni enn eno enp enr ens eo- eob eoe eoi eon eoo eop eor eos ep- epb epe epi epn epo epp epr eps erb ere eri ern ero erp err ers es- esb ese esi esn eso esp esr ess ibb ibe ibi ibn ibo ibp ibr ibs ie- iee iei ien iep ier ies iib iie iii iin iio iip iir iis in- inb ine ini inn ino inp inr ins io- iob ioe ioi ion ioo iop ior ios ipb ipe ipi ipn ipo ipp ipr ips ir- irb ire iri irn iro irp irr irs is- isb ise isi isn iso isp isr iss n-i nbb nbe nbi nbn nbo nbp nbr nbs ne- neb nee nei nen neo nep ner nes nib nie nii nin nio nip nir nis nnb nne nni nnn nno nnp nns no- nob noe noi non noo nop nor nos npb npe npi npn npo npp npr nps nrb nre nri nrn nro nrp nrr nrs nsb nse nsi nsn nso nsp nsr nss o-i ob- obb obe obi obn obo obp obr obs oeb oee oei oen oeo oep oer oes oib oie oii oin oio oip oir ois on- onb one oni onn ono onp onr ons oo- oob ooi oon ooo oop oor oos op- opb ope opi opn opo opp opr ops or- orb ore ori orn oro orp orr ors os- osb ose osi osn oso osp osr oss p-p pbb pbe pbi pbn pbo pbp pbr pbs peb pee pei pen peo pep per pes pib pie pii pin pio pip pir pis pn- pnb pne pni pnn pno pnp pnr pns pob poe poi pon poo pop por pos ppb ppe ppi ppn ppo ppp ppr pps prb pre pri prn pro prp prr prs ps- psb pse psi psn pso psp psr pss rbb rbe rbi rbn rbo rbp rbr rbs re- reb ree rei ren reo rep rer res rib rie rii rin rio rip rir ris rnb rni rnn rno rnp rnr rns rob roe roi ron roo rop ror ros rpb rpe rpi rpn rpo rpp rpr rps rrb rri rrn rrp rrr rrs rsb rse rsi rsn rso rsp rsr rss sbb sbe sbi sbn sbo sbp sbr sbs se- seb see sei sen seo sep ser ses sib sie sii sin sio sip sir sis snb sne sni snn sno snp snr sns sob soe soi son soo sop sor sos spb spe spi spn spo spp spr sps sr- srb sre sri srn sro srp srr srs ss- ssb sse ssi ssn sso ssp ssr sss