Assertion: cue ball | /r/HasProperty | returned for further play
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Source sentences:
text: Coin-operated pool tables historically have often used either a larger ("grapefruit") or denser ("rock", typically ceramic) cue ball, such that its extra weight makes it easy to separate it from object balls (which are captured until the game ends and the table is paid again for another game) so that the cue ball can be returned for further play, should it be accidentally pocketed.