If reference is partly determined by external environment rather than internal content, then content and reference can systematically diverge for natural kind terms without contradiction.

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External environment(as used in epistemology): Everything outside of your mind—the physical world, other people, objects around you.
Internal content(as used in philosophy of mind): The meanings and ideas inside your head—what you're thinking or what a word means based solely on your mental states, without considering the outside world.
Systematically diverge(as used in political philosophy): To regularly and predictably move in different directions or toward different goals, as a pattern rather than by accident.
content(Possible worlds semantics): The proposition expressed by a sentence; in possible worlds semantics, content is identified with an intension.
contradiction(Relevant to distinguishing contradictions from false contingent statements in the logic student variant of the preface paradox.)

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