-er -up c-- ccc cce cco ccp ccr ccs ccu ce- cec cee ceo cep cer ces ceu co- coc coe coo cop cor cos cou cpc cpe cpo cpp cpr cps cpu crc cre cro crp crr crs cru csc cse cso csp csr css csu cuc cue cuo cup cur cus cuu ec- ecc ece eco ecr ecs ecu eec eee eeo eep eer ees eo- eoc eoe eoo eop eor eos eou ep- epc epe epo epp epr eps epu erc ere ero erp err ers eru es- esc ese eso esp esr ess esu eu- euc eue eup eur eus oc- occ oco ocp ocr ocs ocu oec oee oeo oep oer oes oo- ooc ooo oop oor oos op- opc ope opo opp opr ops or- orc ore oro orp orr ors oru os- osc ose oso osp osr oss osu ou- ouc oue ouo oup our ous p-p pcc pce pco pcp pcr pcs pcu pec pee peo pep per pes peu poc poe poo pop por pos pou ppc ppe ppo ppp ppr pps ppu prc pre pro prp prr prs pru ps- psc pse pso psp psr pss psu puc pue pup pur pus puu rcc rce rco rcp rcr rcs rcu re- rec ree reo rep rer res reu roc roe roo rop ror ros rou rpc rpe rpo rpp rpr rps rpu rrc rrp rrr rrs rru rsc rse rso rsp rsr rss rsu ruc rue ruo rup rur rus ruu scc sce sco scp scr scs scu se- sec see seo sep ser ses seu soc soe soo sop sor sos sou spc spe spo spp spr sps spu sr- src sre sro srp srr srs ss- ssc sse sso ssp ssr sss ssu suc sue suo sup sur sus suu ucc uce uco ucp ucr ucs ucu uec uee uep uer ues uoc uoe uoo uop uor uos up- upc upe upo upp upr ups upu ur- urc ure uro urp urr urs uru usc use uso usp usr uss usu uuc uue uur uus uuu