Assertion: trampoline's size | /r/HasProperty | frame
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Source sentences:
text: The trampoline bed is rectangular 4.28 by 2.14 metres (14 ft 1 in × 7 ft 0 in) in size fitted into the 5.05 by 2.91 metres (17 ft × 10 ft) frame  with around 110 steel springs (the actual number may vary by manufacturer).