-er -up c-- ccc cce ccf cck ccp ccr ccu ce- cec cee cef cek cep cer ceu cfc cfe cff cfk cfp cfr cfu ckc cpc cpe cpf cpk cpp cpr cpu crc cre crf crk crp crr cru cuc cue cuf cuk cup cur cuu ec- ecc ece ecf eck ecr ecu eec eee eef eek eep eer ef- efc efe eff efp efr ekc eke ekf ekp ekr eku ep- epc epe epf epp epr epu erc ere erf erk erp err eru eu- euc eue euf eup eur fcc fce fcf fck fcp fcr fcu fec fee fef fek fep fer feu ffc ffe fff ffk ffp ffr ffu fkc fkf fkk fkp fpc fpe fpk fpp fpr fpu frc fre frf frk frp frr fru fue fuf fuk fup fur fuu kcc kce kck kcp kcr kcu ke- kec kee kef kek kep ker kfc kff kfu kkc kke kkk kkp kkr kku kpc kpe kpf kpk kpp kpr kpu krc krf krk krp krr kru kuc kue kuk kup kur kuu p-p pcc pce pcf pck pcp pcr pcu pec pee pef pek pep per peu pfc pfe pff pfk pfp pfr pfu pkc pke pkf pkp pkr pku ppc ppe ppf ppk ppp ppr ppu prc pre prf prk prp prr pru puc pue puf puk pup pur puu rcc rce rcf rcp rcr rcu re- rec ree ref rek rep rer reu rfc rfe rff rfk rfp rfr rfu rkc rke rkf rkk rkp rku rpc rpe rpf rpk rpp rpr rpu rrc rrf rrk rrp rrr rru ruc rue ruf ruk rup rur ruu ucc uce ucf uck ucp ucr ucu uec uee uef uep uer ufc ufe uff ufp ufr ufu ukc uke ukf ukk ukp ukr uku up- upc upe upf upk upp upr upu ur- urc ure urf urk urp urr uru uuc uue uur uuu