-er eee eek eeo eer ees eet eke eko ekr eks ekt eo- eoe eok eoo eor eos eot ere erk ero err ers ert es- ese esk eso esr ess est ete etk eto etr ets ett k-t ke- kee kek keo ker kes ket kke kkk kkr kks kkt koe kok koo kor kos kot krk kro krr krs krt kse ksk kso ksr kss kst kte ktk kto ktr kts ktt oee oeo oer oes oet oke okk oko okr oks oo- ook ooo oor oos oot or- ore ork oro orr ors ort os- ose osk oso osr oss ost ot- ote otk oto otr ots ott re- ree rek reo rer res ret rke rkk rko rks rkt roe rok roo ror ros rot rrk rrr rrs rrt rse rsk rso rsr rss rst rte rtk rto rtr rts rtt se- see sek seo ser ses set sk- ske skk sko skr sks skt soe sok soo sor sos sot sr- sre srk sro srr srs srt ss- sse ssk sso ssr sss sst ste stk sto str sts stt te- tee tek teo ter tes tet tke tkk tko tkr tks tkt to- toe tok too tor tos tot tre trk tro trr trs trt tse tsk tso tsr tss tst tte ttk tto ttr tts ttt