-er a-a a-t aaa aae aao aap aar aas aat aax aea aee aeo aep aer aes aet aex aoa aoe aoo aop aor aos aot aox ap- apa ape apo app apr aps apt apx ar- ara are aro arp arr ars art arx as- asa ase aso asp asr ass ast asx at- ata ate ato atp atr ats att atx ax- axa axe axo axp axr axs axt axx eaa eae eao eap ear eas eat eax eea eee eeo eep eer ees eet eex eo- eoa eoe eoo eop eor eos eot ep- epa epe epo epp epr eps ept epx era ere ero erp err ers ert es- esa ese eso esp esr ess est esx eta ete eto etp etr ets ett etx ex- exa exe exo exp exr exs ext exx oaa oae oao oap oar oas oat oax oea oee oeo oep oer oes oet oex oo- ooa ooo oop oor oos oot oox op- opa ope opo opp opr ops opt opx or- ora ore oro orp orr ors ort orx os- osa ose oso osp osr oss ost osx ot- ota ote oto otp otr ots ott ox- oxa oxo oxt oxx p-p paa pae pao pap par pas pat pax pea pee peo pep per pes pet pex poa poe poo pop por pos pot pox ppa ppe ppo ppp ppr pps ppt ppx pra pre pro prp prr prs prt prx ps- psa pse pso psp psr pss pst psx pt- pta pte pto ptp ptr pts ptt ptx pxe pxr pxs pxt ra- raa rae rao rap rar ras rat rax re- rea ree reo rep rer res ret rex roa roe roo rop ror ros rot rox rpa rpe rpo rpp rpr rps rpt rpx rra rrp rrr rrs rrt rsa rse rso rsp rsr rss rst rsx rta rte rto rtp rtr rts rtt rtx rxp rxr rxs saa sae sao sap sar sas sat sax se- sea see seo sep ser ses set sex soa soe soo sop sor sos sot sox spa spe spo spp spr sps spt spx sr- sra sre sro srp srr srs srt srx ss- ssa sse sso ssp ssr sss sst ssx sta ste sto stp str sts stt stx sxs sxt t-x taa tae tao tap tar tas tat tax te- tea tee teo tep ter tes tet tex to- toa toe too top tor tos tot tox tpa tpe tpo tpp tpr tps tpt tpx tra tre tro trp trr trs trt trx tsa tse tso tsp tsr tss tst tsx tta tte tto ttp ttr tts ttt ttx txe txs txt xaa xap xar xas xat xee xep xer xes xet xex xoa xoo xop xor xos xot xox xpa xpe xpo xpp xps xpt xrt xrx xsa xsp xss xst xtp xtr xts xtx xxo xxp xxx