Assertion: jack's use | /r/CapableOf | use the jackstaff
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Source sentences:
text: The size and power of the Royal Navy internationally at the time could also explain why the flag was named the "Union Jack"; considering the navy was so widely utilised and renowned by the United Kingdom and colonies, it is possible that the term jack occurred because of its regular use on all British ships using the jackstaff (a flag pole attached to the bow of a ship).