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What is the primary similarity between the four human ingredients in the witches' charm?
They represent the human equivalents of the ingredients taken from the animals in the ingredients.
They all come from a person's head, which was symbolic of power and authority.
They are all from people whom the witches would normally regard as allies.
They are each symbolic of the dangers that Macbeth has either faced in the past or will face in the near future.
They come from people who would be considered inferior in the dominant Christian culture of that time.