-er -up c-- ccc cce cck ccp ccr ccu ce- cec cee cek cep cer ceu ckc cpc cpe cpk cpp cpr cpu crc cre crk crp crr cru cuc cue cuk cup cur cuu ec- ecc ece eck ecr ecu eec eee eek eep eer ekc eke ekp ekr eku ep- epc epe epp epr epu erc ere erk erp err eru eu- euc eue eup eur kcc kce kck kcp kcr kcu ke- kec kee kek kep ker kkc kke kkk kkp kkr kku kpc kpe kpk kpp kpr kpu krc krk krp krr kru kuc kue kuk kup kur kuu p-p pcc pce pck pcp pcr pcu pec pee pek pep per peu pkc pke pkp pkr pku ppc ppe ppk ppp ppr ppu prc pre prk prp prr pru puc pue puk pup pur puu rcc rce rcp rcr rcu re- rec ree rek rep rer reu rkc rke rkk rkp rku rpc rpe rpk rpp rpr rpu rrc rrk rrp rrr rru ruc rue ruk rup rur ruu ucc uce uck ucp ucr ucu uec uee uep uer ukc uke ukk ukp ukr uku up- upc upe upk upp upr upu ur- urc ure urk urp urr uru uuc uue uur uuu