Assertion: coin | /r/HasProperty | difficult to detect using x-ray imaging
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Source sentences:
text: The aluminum cents were rejected for two reasons: vending machine owners complained the coins would easily jam machines, causing various mechanical problems; and pediatricians and pediatric radiologists pointed out that if children ingested aluminum pennies, the coins would be difficult to detect using x-ray imaging because the radiodensity of the metal inside the respiratory and gastrointestinal tracts was similar to that of soft tissue.