-er a-a a-t aaa aae aao aap aar aat aax aea aee aeo aep aer aet aex aoa aoe aoo aop aor aot aox ap- apa ape apo app apr apt apx ar- ara are aro arp arr art arx at- ata ate ato atp atr att atx ax- axa axe axo axp axr axt axx eaa eae eao eap ear eat eax eea eee eeo eep eer eet eex eo- eoa eoe eoo eop eor eot ep- epa epe epo epp epr ept epx era ere ero erp err ert eta ete eto etp etr ett etx ex- exa exe exo exp exr ext exx oaa oae oao oap oar oat oax oea oee oeo oep oer oet oex oo- ooa ooo oop oor oot oox op- opa ope opo opp opr opt opx or- ora ore oro orp orr ort orx ot- ota ote oto otp otr ott ox- oxa oxo oxt oxx p-p paa pae pao pap par pat pax pea pee peo pep per pet pex poa poe poo pop por pot pox ppa ppe ppo ppp ppr ppt ppx pra pre pro prp prr prt prx pt- pta pte pto ptp ptr ptt ptx pxe pxr pxt ra- raa rae rao rap rar rat rax re- rea ree reo rep rer ret rex roa roe roo rop ror rot rox rpa rpe rpo rpp rpr rpt rpx rra rrp rrr rrt rta rte rto rtp rtr rtt rtx rxp rxr t-x taa tae tao tap tar tat tax te- tea tee teo tep ter tet tex to- toa toe too top tor tot tox tpa tpe tpo tpp tpr tpt tpx tra tre tro trp trr trt trx tta tte tto ttp ttr ttt ttx txe txt xaa xap xar xat xee xep xer xet xex xoa xoo xop xor xot xox xpa xpe xpo xpp xpt xrt xrx xtp xtr xtx xxo xxp xxx