-er eee eer ees eet eie eii eir eis eit ere eri err ers ert es- ese esi esr ess est ete eti etr ets ett ie- iee iei ier ies iet iie iii iir iis iit ir- ire iri irr irs irt is- ise isi isr iss ist ite iti its itt re- ree rei rer res ret rie rii rir ris rit rri rrr rrs rrt rse rsi rsr rss rst rte rti rtr rts rtt se- see sei ser ses set sie sii sir sis sit sr- sre sri srr srs srt ss- sse ssi ssr sss sst ste sti str sts stt te- tee tei ter tes tet tie tii tir tis tit tre tri trr trs trt tse tsi tsr tss tst tte tti ttr tts ttt