-er -ic c-- ccc cce cci ccp ccr ccv ce- cec cee cei cep cer cev ci- cic cie cii cip cir civ cpc cpe cpi cpp cpr cpv crc cre cri crp crr crv cvc cve cvi cvp cvr cvv ec- ecc ece eci ecr ecv eec eee eep eer eev eic eie eii eip eir eiv ep- epc epe epi epp epr erc ere eri erp err erv evc eve evi evp evr evv i-v icc ice ici icp icr icv ie- iec iee iei iep ier iev iic iie iii iip iir ipc ipe ipi ipp ipr ipv ir- irc ire iri irp irr irv ivc ive ivi ivp ivr ivv p-p pcc pce pci pcp pcr pcv pec pee pei pep per pev pic pie pii pip pir piv ppc ppe ppi ppp ppr ppv prc pre pri prp prr prv pvc pve pvi pvp pvr pvv rcc rce rci rcp rcr rcv re- rec ree rei rep rer rev ric rie rii rip rir riv rpc rpe rpi rpp rpr rpv rrc rri rrp rrr rvc rve rvi rvp rvr rvv v-e vcc vce vci vcp vcr vec vee vei vep ver vi- vic vie vii vip vir viv vpc vpe vpi vpp vpr vrc vre vri vrp vrr vvc vvi vvr vvv