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operatio operatione operationem operationes operationis operationum operator operatorem operatum operatur Operatur Operatus operatus operatusque operculum opere Opere operemini operemur operetur operi Operi operiam operiant operiantur operias operiat operiatur operibus operiebamini operiebant operiebaris operiebat operiebatis operiemur operiemus operienda operiendos operiendum operient operiente operientes operientur operieris operies operiet operietis operietur operimentis operimento