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This figure shows the result of adding two opposing claims to the map from Figure 2. We use our concise notation to describe the map: MC ‘Eating carrots improves eyesight.’ SUPPORT 1 ‘Carrots are a source of Vitamin A.’ 2 ‘Taking vitamin A can reduce the risk of poor vision in individuals with a vitamin deficiency.’ OPPOSE 3 ‘Carrots are a source of beta carotene’ 4 ‘Beta carotene supplements will not strengthen eyesight or slow decline in healthy people.’