-er -ic c-- ccc cce cci cck ccp ccr ccs cct ce- cec cee cei cek cep cer ces cet ci- cic cie cii cik cip cir cis cit ckc cki cks ckt cpc cpe cpi cpk cpp cpr cps cpt crc cre cri crk crp crr crs crt csc cse csi csk csp csr css cst ctc cte cti ctk ctp ctr cts ctt ec- ecc ece eci eck ecr ecs ect eec eee eek eep eer ees eet eic eie eii eik eip eir eis eit ekc eke eki ekp ekr eks ekt ep- epc epe epi epp epr eps ept erc ere eri erk erp err ers ert es- esc ese esi esk esp esr ess est etc ete eti etk etp etr ets ett icc ice ici ick icp icr ics ict ie- iec iee iei iek iep ier ies iet iic iie iii iip iir iis iit ikc ike iki ikk ikr iks ikt ipc ipe ipi ipp ipr ips ipt ir- irc ire iri irk irp irr irs irt is- isc ise isi isk isp isr iss ist itc ite iti itk itp its itt k-t kcc kce kci kck kcp kcr kcs kct ke- kec kee kei kek kep ker kes ket kic kie kii kik kip kir kis kit kkc kke kki kkk kkp kkr kks kkt kpc kpe kpi kpk kpp kpr kps kpt krc kri krk krp krr krs krt ksc kse ksi ksk ksp ksr kss kst ktc kte ktk ktp ktr kts ktt p-p pcc pce pci pck pcp pcr pcs pct pec pee pei pek pep per pes pet pic pie pii pik pip pir pis pit pkc pke pki pkp pkr pks pkt ppc ppe ppi ppk ppp ppr pps ppt prc pre pri prk prp prr prs prt ps- psc pse psi psk psp psr pss pst pt- ptc pte pti ptk ptp ptr pts ptt rcc rce rci rcp rcr rcs rct re- rec ree rei rek rep rer res ret ric rie rii rik rip rir ris rit rkc rke rkk rkp rks rkt rpc rpe rpi rpk rpp rpr rps rpt rrc rri rrk rrp rrr rrs rrt rsc rse rsi rsk rsp rsr rss rst rtc rte rti rtk rtp rtr rts rtt scc sce sci sck scp scr scs sct se- sec see sei sek sep ser ses set sic sie sii sik sip sir sis sit sk- skc ske ski skk skp skr sks skt spc spe spi spk spp spr sps spt sr- src sre sri srk srp srr srs srt ss- ssc sse ssi ssk ssp ssr sss sst stc ste sti stk stp str sts stt tcc tce tci tck tcp tcr tcs tct te- tec tee tei tek tep ter tes tet tic tie tii tik tip tir tis tit tkc tke tkk tkp tkr tks tkt tpc tpe tpi tpk tpp tpr tps tpt trc tre tri trk trp trr trs trt tsc tse tsi tsk tsp tsr tss tst ttc tte tti ttk ttp ttr tts ttt