eee eeo eep ees eet eex eo- eoe eoo eop eos eot ep- epe epo epp eps ept epx es- ese eso esp ess est esx ete eto etp ets ett etx ex- exe exo exp exs ext exx oee oeo oep oes oet oex oo- ooo oop oos oot oox op- ope opo opp ops opt opx os- ose oso osp oss ost osx ot- ote oto otp ots ott ox- oxo oxt oxx p-p pee peo pep pes pet pex poe poo pop pos pot pox ppe ppo ppp pps ppt ppx ps- pse pso psp pss pst psx pt- pte pto ptp pts ptt ptx pxe pxs pxt se- see seo sep ses set sex soe soo sop sos sot sox spe spo spp sps spt spx ss- sse sso ssp sss sst ssx ste sto stp sts stt stx sxs sxt t-x te- tee teo tep tes tet tex to- toe too top tos tot tox tpe tpo tpp tps tpt tpx tse tso tsp tss tst tsx tte tto ttp tts ttt ttx txe txs txt xee xep xes xet xex xoo xop xos xot xox xpe xpo xpp xps xpt xsp xss xst xtp xts xtx xxo xxp xxx