-er eee eek eeo eer ees eet eie eii eik eio eir eis eit eke eki eko ekr eks ekt eo- eoe eoi eok eoo eor eos eot ere eri erk ero err ers ert es- ese esi esk eso esr ess est ete eti etk eto etr ets ett ie- iee iei iek ier ies iet iie iii iio iir iis iit ike iki ikk iko ikr iks ikt io- ioe ioi ioo ior ios iot ir- ire iri irk iro irr irs irt is- ise isi isk iso isr iss ist ite iti itk ito its itt k-t ke- kee kei kek keo ker kes ket kie kii kik kio kir kis kit kke kki kkk kkr kks kkt koe koi kok koo kor kos kot kri krk kro krr krs krt kse ksi ksk kso ksr kss kst kte ktk kto ktr kts ktt o-i oee oei oeo oer oes oet oie oii oik oio oir ois oit oke oki okk oko okr oks oo- ooi ook ooo oor oos oot or- ore ori ork oro orr ors ort os- ose osi osk oso osr oss ost ot- ote oti otk oto otr ots ott re- ree rei rek reo rer res ret rie rii rik rio rir ris rit rke rkk rko rks rkt roe roi rok roo ror ros rot rri rrk rrr rrs rrt rse rsi rsk rso rsr rss rst rte rti rtk rto rtr rts rtt se- see sei sek seo ser ses set sie sii sik sio sir sis sit sk- ske ski skk sko skr sks skt soe soi sok soo sor sos sot sr- sre sri srk sro srr srs srt ss- sse ssi ssk sso ssr sss sst ste sti stk sto str sts stt te- tee tei tek teo ter tes tet tie tii tik tio tir tis tit tke tkk tko tkr tks tkt to- toe toi tok too tor tos tot tre tri trk tro trr trs trt tse tsi tsk tso tsr tss tst tte tti ttk tto ttr tts ttt