Assertion: stone castle | /r/HasProperty | supported by a line of four earthwork forts
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Source sentences:
text: The stone castles were supported by a line of four earthwork forts, known as the Great Turf, the Little Turf Bulwark, the Great White Bulwark of Clay and the Walmer Bulwark, and a 2.5-mile-long (4.0 km) defensive ditch and bank.