b-p bbb bbe bbn bbo bbp bbs bbt be- beb bee ben beo bep bes bet bnb bne bnn bno bnp bns bnt bob boe bon boo bop bos bot bpb bpe bpn bpo bpp bps bpt bsb bse bsn bso bsp bss bst btb bte btn bto btp bts btt ebb ebe ebn ebo ebp ebs ebt eeb eee een eeo eep ees eet en- enb ene enn eno enp ens ent eo- eob eoe eon eoo eop eos eot ep- epb epe epn epo epp eps ept es- esb ese esn eso esp ess est etb ete etn eto etp ets ett nbb nbe nbn nbo nbp nbs nbt ne- neb nee nen neo nep nes net nnb nne nnn nno nnp nns nnt no- nob noe non noo nop nos not npb npe npn npo npp nps npt nsb nse nsn nso nsp nss nst ntb nte ntn nto ntp nts ntt ob- obb obe obn obo obp obs obt oeb oee oen oeo oep oes oet on- onb one onn ono onp ons ont oo- oob oon ooo oop oos oot op- opb ope opn opo opp ops opt os- osb ose osn oso osp oss ost ot- otb ote otn oto otp ots ott p-p pbb pbe pbn pbo pbp pbs pbt peb pee pen peo pep pes pet pn- pnb pne pnn pno pnp pns pnt pob poe pon poo pop pos pot ppb ppe ppn ppo ppp pps ppt ps- psb pse psn pso psp pss pst pt- ptb pte ptn pto ptp pts ptt sbb sbe sbn sbo sbp sbs sbt se- seb see sen seo sep ses set snb sne snn sno snp sns snt sob soe son soo sop sos sot spb spe spn spo spp sps spt ss- ssb sse ssn sso ssp sss sst stb ste stn sto stp sts stt tbb tbe tbn tbo tbp tbs tbt te- teb tee ten teo tep tes tet tnb tne tnn tno tnp tns tnt to- tob toe ton too top tos tot tpb tpe tpn tpo tpp tps tpt tsb tse tsn tso tsp tss tst ttb tte ttn tto ttp tts ttt