-er eee eek eep eer ees eet eie eii eik eip eir eis eit eke eki ekp ekr eks ekt ep- epe epi epp epr eps ept ere eri erk erp err ers ert es- ese esi esk esp esr ess est ete eti etk etp etr ets ett ie- iee iei iek iep ier ies iet iie iii iip iir iis iit ike iki ikk ikr iks ikt ipe ipi ipp ipr ips ipt ir- ire iri irk irp irr irs irt is- ise isi isk isp isr iss ist ite iti itk itp its itt k-t ke- kee kei kek kep ker kes ket kie kii kik kip kir kis kit kke kki kkk kkp kkr kks kkt kpe kpi kpk kpp kpr kps kpt kri krk krp krr krs krt kse ksi ksk ksp ksr kss kst kte ktk ktp ktr kts ktt p-p pee pei pek pep per pes pet pie pii pik pip pir pis pit pke pki pkp pkr pks pkt ppe ppi ppk ppp ppr pps ppt pre pri prk prp prr prs prt ps- pse psi psk psp psr pss pst pt- pte pti ptk ptp ptr pts ptt re- ree rei rek rep rer res ret rie rii rik rip rir ris rit rke rkk rkp rks rkt rpe rpi rpk rpp rpr rps rpt rri rrk rrp rrr rrs rrt rse rsi rsk rsp rsr rss rst rte rti rtk rtp rtr rts rtt se- see sei sek sep ser ses set sie sii sik sip sir sis sit sk- ske ski skk skp skr sks skt spe spi spk spp spr sps spt sr- sre sri srk srp srr srs srt ss- sse ssi ssk ssp ssr sss sst ste sti stk stp str sts stt te- tee tei tek tep ter tes tet tie tii tik tip tir tis tit tke tkk tkp tkr tks tkt tpe tpi tpk tpp tpr tps tpt tre tri trk trp trr trs trt tse tsi tsk tsp tsr tss tst tte tti ttk ttp ttr tts ttt