-er eee eek eer ees eet eie eii eik eir eis eit eke eki ekr eks ekt ere eri erk err ers ert es- ese esi esk esr ess est ete eti etk etr ets ett ie- iee iei iek ier ies iet iie iii iir iis iit ike iki ikk ikr iks ikt ir- ire iri irk irr irs irt is- ise isi isk isr iss ist ite iti itk its itt k-t ke- kee kei kek ker kes ket kie kii kik kir kis kit kke kki kkk kkr kks kkt kri krk krr krs krt kse ksi ksk ksr kss kst kte ktk ktr kts ktt re- ree rei rek rer res ret rie rii rik rir ris rit rke rkk rks rkt rri rrk rrr rrs rrt rse rsi rsk rsr rss rst rte rti rtk rtr rts rtt se- see sei sek ser ses set sie sii sik sir sis sit sk- ske ski skk skr sks skt sr- sre sri srk srr srs srt ss- sse ssi ssk ssr sss sst ste sti stk str sts stt te- tee tei tek ter tes tet tie tii tik tir tis tit tke tkk tkr tks tkt tre tri trk trr trs trt tse tsi tsk tsr tss tst tte tti ttk ttr tts ttt