-er -up c-- ccc cce cco ccp ccr ccu ccv ce- cec cee ceo cep cer ceu cev co- coc coe coo cop cor cou cov cpc cpe cpo cpp cpr cpu cpv crc cre cro crp crr cru crv cuc cue cuo cup cur cuu cuv cvc cve cvo cvp cvr cvu cvv ec- ecc ece eco ecr ecu ecv eec eee eeo eep eer eev eo- eoc eoe eoo eop eor eou ep- epc epe epo epp epr epu erc ere ero erp err eru erv eu- euc eue eup eur euv evc eve evo evp evr evv oc- occ oco ocp ocr ocu ocv oec oee oeo oep oer oo- ooc ooo oop oor oov op- opc ope opo opp opr opv or- orc ore oro orp orr oru orv ou- ouc oue ouo oup our ov- ovc ove ovo ovp ovv p-p pcc pce pco pcp pcr pcu pcv pec pee peo pep per peu pev poc poe poo pop por pou pov ppc ppe ppo ppp ppr ppu ppv prc pre pro prp prr pru prv puc pue pup pur puu pvc pve pvo pvp pvr pvu pvv rcc rce rco rcp rcr rcu rcv re- rec ree reo rep rer reu rev roc roe roo rop ror rou rov rpc rpe rpo rpp rpr rpu rpv rrc rrp rrr rru ruc rue ruo rup rur ruu ruv rvc rve rvo rvp rvr rvu rvv ucc uce uco ucp ucr ucu ucv uec uee uep uer uoc uoe uoo uop uor up- upc upe upo upp upr upu upv ur- urc ure uro urp urr uru uuc uue uur uuu uvc uve uvo uvu uvv v-e vcc vce vco vcp vcr vcu vec vee veo vep ver veu voc voe voo vop vor vou vov vpc vpe vpo vpp vpr vpu vrc vre vrp vrr vru vue vup vur vuv vvc vvo vvr vvv