The brownie and pineapple cheesecake have a marginal value, because their value is at the limit of their sign constraints.
布朗尼和菠萝芝士蛋糕都有一个临界值，因为它们的值受到了符号约束的限制。
Pineapple cheesecake (1 piece): 500 calories, 0 oz chocolate, 4 oz sugar, 5 oz fat
菠萝芝士蛋糕（1 片）：500 卡路里能量，0 盎司巧克力，4 盎司糖，5 盎司脂肪
At present, the following four foods are available for consumption: brownies, chocolate ice cream, cola, and pineapple cheesecake.
现在有4种食品可以选择：巧克力松糕、巧克力冰激凌、可乐和菠萝芝士蛋糕。
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