How can we be sure that we perceive color the same way? In other words, how do I

How can we be sure that we perceive color the same way? In other words, how do I know that the red I see looks the same as the red that you see? We are taught from birth to identify red objects as red, but what if what someone calls red really looks green for example, yet they only call it red because that is what has been taught?

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