b-p bbb bbe bbm bbn bbo bbp bbs be- beb bee bem ben beo bep bes bmb bme bmm bmn bmo bmp bms bnb bne bnn bno bnp bns bob boe bom bon boo bop bos bpb bpe bpm bpn bpo bpp bps bsb bse bsm bsn bso bsp bss ebb ebe ebm ebn ebo ebp ebs eeb eee eem een eeo eep ees em- emb eme emm emn emo emp ems en- enb ene enm enn eno enp ens eo- eob eoe eom eon eoo eop eos ep- epb epe epm epn epo epp eps es- esb ese esm esn eso esp ess m-o mbb mbe mbm mbo mbp mbs meb mee mem men meo mep mes mmb mme mmm mmn mmo mmp mms mnb mne mnm mnn mno mnp mns mob moe mom mon moo mop mos mpb mpe mpm mpn mpo mpp mps msb mse msm msn mso msp mss nbb nbe nbm nbn nbo nbp nbs ne- neb nee nem nen neo nep nes nmb nme nmm nmn nmo nmp nms nnb nne nnm nnn nno nnp nns no- nob noe nom non noo nop nos npb npe npm npn npo npp nps nsb nse nsm nsn nso nsp nss ob- obb obe obm obn obo obp obs oeb oee oem oen oeo oep oes om- omb ome omm omn omo omp oms on- onb one onn ono onp ons oo- oob oom oon ooo oop oos op- opb ope opm opn opo opp ops os- osb ose osm osn oso osp oss p-p pbb pbe pbm pbn pbo pbp pbs peb pee pem pen peo pep pes pmb pme pmm pmn pmo pmp pms pn- pnb pne pnm pnn pno pnp pns pob poe pom pon poo pop pos ppb ppe ppm ppn ppo ppp pps ps- psb pse psm psn pso psp pss sbb sbe sbm sbn sbo sbp sbs se- seb see sem sen seo sep ses smb sme smm smn smo smp sms snb sne snm snn sno snp sns sob soe som son soo sop sos spb spe spm spn spo spp sps ss- ssb sse ssm ssn sso ssp sss