b-p bbb bbe bbi bbn bbo bbp bbs be- beb bee bei ben beo bep bes bi- bib bie bii bin bio bip bis bnb bne bni bnn bno bnp bns bob boe boi bon boo bop bos bpb bpe bpi bpn bpo bpp bps bsb bse bsi bsn bso bsp bss ebb ebe ebi ebn ebo ebp ebs eeb eee een eeo eep ees eib eie eii ein eio eip eis en- enb ene eni enn eno enp ens eo- eob eoe eoi eon eoo eop eos ep- epb epe epi epn epo epp eps es- esb ese esi esn eso esp ess ibb ibe ibi ibn ibo ibp ibs ie- iee iei ien iep ies iib iie iii iin iio iip iis in- inb ine ini inn ino inp ins io- iob ioe ioi ion ioo iop ios ipb ipe ipi ipn ipo ipp ips is- isb ise isi isn iso isp iss n-i nbb nbe nbi nbn nbo nbp nbs ne- neb nee nei nen neo nep nes nib nie nii nin nio nip nis nnb nne nni nnn nno nnp nns no- nob noe noi non noo nop nos npb npe npi npn npo npp nps nsb nse nsi nsn nso nsp nss o-i ob- obb obe obi obn obo obp obs oeb oee oei oen oeo oep oes oib oie oii oin oio oip ois on- onb one oni onn ono onp ons oo- oob ooi oon ooo oop oos op- opb ope opi opn opo opp ops os- osb ose osi osn oso osp oss p-p pbb pbe pbi pbn pbo pbp pbs peb pee pei pen peo pep pes pib pie pii pin pio pip pis pn- pnb pne pni pnn pno pnp pns pob poe poi pon poo pop pos ppb ppe ppi ppn ppo ppp pps ps- psb pse psi psn pso psp pss sbb sbe sbi sbn sbo sbp sbs se- seb see sei sen seo sep ses sib sie sii sin sio sip sis snb sne sni snn sno snp sns sob soe soi son soo sop sos spb spe spi spn spo spp sps ss- ssb sse ssi ssn sso ssp sss