Assertion: bowling ball's coverstock | /r/HasProperty | generated by bowling balls
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Source sentences:
text: It can be said that the factors most affecting ball motion changes resulting from oil carry-down are the volume of oil application on the front portion of the lane surface, the distance of the lane oil pattern, the number of deliveries made on a given lane in a given period of time, and the coverstock generated by bowling balls delivered on the given lane.