-er -up c-- ccc cce cck cco ccp ccr ccs ccu ce- cec cee cek ceo cep cer ces ceu ckc cko cks co- coc coe cok coo cop cor cos cou cpc cpe cpk cpo cpp cpr cps cpu crc cre crk cro crp crr crs cru csc cse csk cso csp csr css csu cuc cue cuk cuo cup cur cus cuu ec- ecc ece eck eco ecr ecs ecu eec eee eek eeo eep eer ees ekc eke eko ekp ekr eks eku eo- eoc eoe eok eoo eop eor eos eou ep- epc epe epo epp epr eps epu erc ere erk ero erp err ers eru es- esc ese esk eso esp esr ess esu eu- euc eue eup eur eus kcc kce kck kcp kcr kcs kcu ke- kec kee kek keo kep ker kes kkc kke kkk kkp kkr kks kku koc koe kok koo kop kor kos kou kpc kpe kpk kpo kpp kpr kps kpu krc krk kro krp krr krs kru ksc kse ksk kso ksp ksr kss ksu kuc kue kuk kup kur kus kuu oc- occ ock oco ocp ocr ocs ocu oec oee oeo oep oer oes okc oke okk oko okp okr oks oku oo- ooc ook ooo oop oor oos op- opc ope opk opo opp opr ops or- orc ore ork oro orp orr ors oru os- osc ose osk oso osp osr oss osu ou- ouc oue ouk ouo oup our ous p-p pcc pce pck pco pcp pcr pcs pcu pec pee pek peo pep per pes peu pkc pke pko pkp pkr pks pku poc poe pok poo pop por pos pou ppc ppe ppk ppo ppp ppr pps ppu prc pre prk pro prp prr prs pru ps- psc pse psk pso psp psr pss psu puc pue puk pup pur pus puu rcc rce rco rcp rcr rcs rcu re- rec ree rek reo rep rer res reu rkc rke rkk rko rkp rks rku roc roe rok roo rop ror ros rou rpc rpe rpk rpo rpp rpr rps rpu rrc rrk rrp rrr rrs rru rsc rse rsk rso rsp rsr rss rsu ruc rue ruk ruo rup rur rus ruu scc sce sck sco scp scr scs scu se- sec see sek seo sep ser ses seu sk- skc ske skk sko skp skr sks sku soc soe sok soo sop sor sos sou spc spe spk spo spp spr sps spu sr- src sre srk sro srp srr srs ss- ssc sse ssk sso ssp ssr sss ssu suc sue suk suo sup sur sus suu ucc uce uck uco ucp ucr ucs ucu uec uee uep uer ues ukc uke ukk ukp ukr uku uoc uoe uok uoo uop uor uos up- upc upe upk upo upp upr ups upu ur- urc ure urk uro urp urr urs uru usc use usk uso usp usr uss usu uuc uue uur uus uuu