Assertion: cave | /r/MadeOf | immense 500 square metres
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Source sentences:
text: The cave consists of an immense 500 square metres (5,400 sq ft) rectangular chamber at the foot of a limestone hill, which rises to the northeast above the village of Theopetra, with an entrance 17 metres (56 ft) wide by 3 metres (9.8 ft) high.