What is the primary purpose of the All-Different Constraint in CSPs?

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Ensures that all variables within a specified set take on the same values.

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Ensures that all variables in a specified set must take unique values.

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Ensures that all variables in a specified set are non-negative.

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Ensures that each variable in a set is assigned a value based on a specific arithmetic progression.

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Ensures that no two variables in a specified set are assigned consecutive numerical values.

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