Assertion: shredder's enemy | /r/HasProperty | arch-
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Source sentences:
text: Shredder was a master of Ninjutsu who was an arch-enemy to Splinter and the turtles, the former 'adoptive father' of Karai, the fearless leader of The Foot Clan, and one of the two main antagonists of the series, the other one being Kraang Prime.