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Harry Potter (#4) and the Goblet of Fire
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impregnable -- as in: the fort was impregnable
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Harry Potter (#4) and the Goblet of Fire
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  • Harry — we’ve just got to grit our teeth and do it," said Ron on Friday morning, in a tone that suggested they were planning the storming of an impregnable fortress.

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  • an impregnable fortress
  • an impregnable argument

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