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Not permanently: the predication does not endure throughout the subject's existence.
It does not mean the previously asserted predicate never occurs. It may hold continuously under a specified description while failing to hold over the subject's whole lifetime.
For example:
“The writer moves the fingers while writing” — a claim bound to the descriptive condition.
“Not permanently” — the movement is not predicated of that person at every moment of existence.
Thus truth while a condition holds is different from permanence throughout the subject's existence.