-er a-a a-t aaa aae aap aar aas aat aax aea aee aep aer aes aet aex ap- apa ape app apr aps apt apx ar- ara are arp arr ars art arx as- asa ase asp asr ass ast asx at- ata ate atp atr ats att atx ax- axa axe axp axr axs axt axx eaa eae eap ear eas eat eax eea eee eep eer ees eet eex ep- epa epe epp epr eps ept epx era ere erp err ers ert es- esa ese esp esr ess est esx eta ete etp etr ets ett etx ex- exa exe exp exr exs ext exx p-p paa pae pap par pas pat pax pea pee pep per pes pet pex ppa ppe ppp ppr pps ppt ppx pra pre prp prr prs prt prx ps- psa pse psp psr pss pst psx pt- pta pte ptp ptr pts ptt ptx pxe pxr pxs pxt ra- raa rae rap rar ras rat rax re- rea ree rep rer res ret rex rpa rpe rpp rpr rps rpt rpx rra rrp rrr rrs rrt rsa rse rsp rsr rss rst rsx rta rte rtp rtr rts rtt rtx rxp rxr rxs saa sae sap sar sas sat sax se- sea see sep ser ses set sex spa spe spp spr sps spt spx sr- sra sre srp srr srs srt srx ss- ssa sse ssp ssr sss sst ssx sta ste stp str sts stt stx sxs sxt t-x taa tae tap tar tas tat tax te- tea tee tep ter tes tet tex tpa tpe tpp tpr tps tpt tpx tra tre trp trr trs trt trx tsa tse tsp tsr tss tst tsx tta tte ttp ttr tts ttt ttx txe txs txt xaa xap xar xas xat xee xep xer xes xet xex xpa xpe xpp xps xpt xrt xrx xsa xsp xss xst xtp xtr xts xtx xxp xxx