Assertion: ballpoint pen's point | /r/CapableOf | roll ink
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Source sentences:
text: Ballpoint pen (also “biro” and “ball pen”) is a writing instrument that has a metal ball at its point which rolls and moves ink from an internal reservoir to the surface on which pen writes and, at the same time, works as a buffer between the ink in the reservoir and the air outside and protects this ink from drying.