b-p bbb bbe bbo bbp bbs bbt bbx be- beb bee beo bep bes bet bex bob boe boo bop bos bot box bpb bpe bpo bpp bps bpt bpx bsb bse bso bsp bss bst bsx btb bte bto btp bts btt btx bxb bxo bxx ebb ebe ebo ebp ebs ebt ebx eeb eee eeo eep ees eet eex eo- eob eoe eoo eop eos eot ep- epb epe epo epp eps ept epx es- esb ese eso esp ess est esx etb ete eto etp ets ett etx ex- exe exo exp exs ext exx ob- obb obe obo obp obs obt obx oeb oee oeo oep oes oet oex oo- oob ooo oop oos oot oox op- opb ope opo opp ops opt opx os- osb ose oso osp oss ost osx ot- otb ote oto otp ots ott ox- oxb oxo oxt oxx p-p pbb pbe pbo pbp pbs pbt pbx peb pee peo pep pes pet pex pob poe poo pop pos pot pox ppb ppe ppo ppp pps ppt ppx ps- psb pse pso psp pss pst psx pt- ptb pte pto ptp pts ptt ptx pxe pxs pxt sbb sbe sbo sbp sbs sbt sbx se- seb see seo sep ses set sex sob soe soo sop sos sot sox spb spe spo spp sps spt spx ss- ssb sse sso ssp sss sst ssx stb ste sto stp sts stt stx sxs sxt t-x tbb tbe tbo tbp tbs tbt te- teb tee teo tep tes tet tex to- tob toe too top tos tot tox tpb tpe tpo tpp tps tpt tpx tsb tse tso tsp tss tst tsx ttb tte tto ttp tts ttt ttx txe txs txt xbe xbx xee xep xes xet xex xoo xop xos xot xox xpb xpe xpo xpp xps xpt xsb xsp xss xst xtp xts xtx xxo xxp xxx