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observational economy » observational astronomy, observational cohort, observational cinema
observational context » observational concepts, observational contacts, observation content
observational basis » observational facts, observational data, observational clues
observational case » observation case, observational clues, observational frame
observational economy » observational astronomy, observational cohort, observational cinema
observational context » observational concepts, observational contacts, observation content
observational basis » observational facts, observational data, observational clues
observational case » observation case, observational clues, observational frame