-er -up c-- ccc cce ccn ccp ccr ccu ce- cec cee cen cep cer ceu cn- cnc cne cnn cnp cnr cnu cpc cpe cpn cpp cpr cpu crc cre crn crp crr cru cuc cue cun cup cur cuu ec- ecc ece ecn ecr ecu eec eee een eep eer en- enc ene enn enp enr enu ep- epc epe epn epp epr epu erc ere ern erp err eru eu- euc eue eun eup eur ncc nce ncn ncp ncr ncu ne- nec nee nen nep ner neu nnc nne nnn nnp nnu npc npe npn npp npr npu nrc nre nrn nrp nrr nru nuc nue nun nup nur nuu p-p pcc pce pcn pcp pcr pcu pec pee pen pep per peu pn- pnc pne pnn pnp pnr pnu ppc ppe ppn ppp ppr ppu prc pre prn prp prr pru puc pue pun pup pur puu rcc rce rcn rcp rcr rcu re- rec ree ren rep rer reu rnc rnn rnp rnr rnu rpc rpe rpn rpp rpr rpu rrc rrn rrp rrr rru ruc rue run rup rur ruu ucc uce ucn ucp ucr ucu uec uee uen uep uer un- unc une unn unp unr unu up- upc upe upn upp upr upu ur- urc ure urn urp urr uru uuc uue uun uur uuu