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In page Use–mention distinction:
"Stanisław Leśniewski was perhaps the first to make widespread use of this distinction and the fallacy that arises from overlooking it, seeing it all around in analytic philosophy of the time, for example in Russell and Whitehead's Principia Mathematica.[3] At the logical level, a use–mention mistake occurs when two heterogeneous levels of meaning or context are confused inadvertently.
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