-er eee eeo eer ees eet eex eie eii eio eir eis eit eix eo- eoe eoi eoo eor eos eot ere eri ero err ers ert es- ese esi eso esr ess est esx ete eti eto etr ets ett etx ex- exe exi exo exr exs ext exx ie- iee iei ier ies iet iex iie iii iio iir iis iit iix io- ioe ioi ioo ior ios iot ir- ire iri iro irr irs irt irx is- ise isi iso isr iss ist ite iti ito its itt itx ixe ixi o-i oee oei oeo oer oes oet oex oie oii oio oir ois oit oo- ooi ooo oor oos oot oox or- ore ori oro orr ors ort orx os- ose osi oso osr oss ost osx ot- ote oti oto otr ots ott ox- oxi oxo oxt oxx re- ree rei reo rer res ret rex rie rii rio rir ris rit rix roe roi roo ror ros rot rox rri rrr rrs rrt rse rsi rso rsr rss rst rsx rte rti rto rtr rts rtt rtx rxr rxs se- see sei seo ser ses set sex sie sii sio sir sis sit six soe soi soo sor sos sot sox sr- sre sri sro srr srs srt srx ss- sse ssi sso ssr sss sst ssx ste sti sto str sts stt stx sxi sxs sxt t-x te- tee tei teo ter tes tet tex tie tii tio tir tis tit tix to- toe toi too tor tos tot tox tre tri tro trr trs trt trx tse tsi tso tsr tss tst tsx tte tti tto ttr tts ttt ttx txe txi txs txt xee xer xes xet xex xie xii xio xis xit xix xoi xoo xor xos xot xox xrt xrx xsi xss xst xti xtr xts xtx xxi xxo xxx