-er eee eeo eer ees eet eie eii eio eir eis eit eo- eoe eoi eoo eor eos eot ere eri ero err ers ert es- ese esi eso esr ess est ete eti eto etr ets ett ie- iee iei ier ies iet iie iii iio iir iis iit io- ioe ioi ioo ior ios iot ir- ire iri iro irr irs irt is- ise isi iso isr iss ist ite iti ito its itt o-i oee oei oeo oer oes oet oie oii oio oir ois oit oo- ooi ooo oor oos oot or- ore ori oro orr ors ort os- ose osi oso osr oss ost ot- ote oti oto otr ots ott re- ree rei reo rer res ret rie rii rio rir ris rit roe roi roo ror ros rot rri rrr rrs rrt rse rsi rso rsr rss rst rte rti rto rtr rts rtt se- see sei seo ser ses set sie sii sio sir sis sit soe soi soo sor sos sot sr- sre sri sro srr srs srt ss- sse ssi sso ssr sss sst ste sti sto str sts stt te- tee tei teo ter tes tet tie tii tio tir tis tit to- toe toi too tor tos tot tre tri tro trr trs trt tse tsi tso tsr tss tst tte tti tto ttr tts ttt