Assertion: pen | /r/CapableOf | stain pen
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Source sentences:
text: Despite the fact that the fountain pen is a more modern variation of the dip pen, it still dates back centuries to 973 when Ma’ād al-Mu’izz, the caliph of the Maghreb requested a pen that wouldn’t stain and was given a pen with a built-in reservoir for the ink that could be held upside down without leaking.