-er -ey c-- ccc cce cck ccp ccr ccs ce- cec cee cek cep cer ces cey ckc cks cky cpc cpe cpk cpp cpr cps crc cre crk crp crr crs cry csc cse csk csp csr css csy cyc cye cyk cyp cyr cys ec- ecc ece eck ecr ecs eec eee eek eep eer ees eey ekc eke ekp ekr eks eky ep- epc epe epp epr eps erc ere erk erp err ers ery es- esc ese esk esp esr ess esy eyc eye eyp eyr eys kcc kce kck kcp kcr kcs ke- kec kee kek kep ker kes key kkc kke kkk kkp kkr kks kky kpc kpe kpk kpp kpr kps krc krk krp krr krs kry ksc kse ksk ksp ksr kss kyc kye kyp kyr kys p-p pcc pce pck pcp pcr pcs pec pee pek pep per pes pey pkc pke pkp pkr pks pky ppc ppe ppk ppp ppr pps prc pre prk prp prr prs pry ps- psc pse psk psp psr pss psy py- pyc pye pyk pyr pys rcc rce rcp rcr rcs re- rec ree rek rep rer res rey rkc rke rkk rkp rks rky rpc rpe rpk rpp rpr rps rrc rrk rrp rrr rrs rsc rse rsk rsp rsr rss ry- ryc rye ryk ryr rys ryy scc sce sck scp scr scs se- sec see sek sep ser ses sey sk- skc ske skk skp skr sks sky spc spe spk spp spr sps spy sr- src sre srk srp srr srs sry ss- ssc sse ssk ssp ssr sss sy- syc sye syk syp syr sys ycc yce ycp ycs ycy yec yee yek yep yer yes yey ykk yps yrc yre yrp yrs ysc yse ysk ysp ysr yss ysy yyc yye yys yyy