b-p bbb bbe bbi bbn bbp bbs be- beb bee bei ben bep bes bi- bib bie bii bin bip bis bnb bne bni bnn bnp bns bpb bpe bpi bpn bpp bps bsb bse bsi bsn bsp bss ebb ebe ebi ebn ebp ebs eeb eee een eep ees eib eie eii ein eip eis en- enb ene eni enn enp ens ep- epb epe epi epn epp eps es- esb ese esi esn esp ess ibb ibe ibi ibn ibp ibs ie- iee iei ien iep ies iib iie iii iin iip iis in- inb ine ini inn inp ins ipb ipe ipi ipn ipp ips is- isb ise isi isn isp iss n-i nbb nbe nbi nbn nbp nbs ne- neb nee nei nen nep nes nib nie nii nin nip nis nnb nne nni nnn nnp nns npb npe npi npn npp nps nsb nse nsi nsn nsp nss p-p pbb pbe pbi pbn pbp pbs peb pee pei pen pep pes pib pie pii pin pip pis pn- pnb pne pni pnn pnp pns ppb ppe ppi ppn ppp pps ps- psb pse psi psn psp pss sbb sbe sbi sbn sbp sbs se- seb see sei sen sep ses sib sie sii sin sip sis snb sne sni snn snp sns spb spe spi spn spp sps ss- ssb sse ssi ssn ssp sss