Assertion: secretariat | /r/HasProperty | the first
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Source sentences:
text: Lusky told New York Times writer Victor Mather that when he started the project, he assumed he would be trying to show that Secretariat was the first to run the Preakness distance in 1:53 2/5 — a time also later posted by Preakness winners Tank’s Prospect, Louis Quatorze and Curlin.
text: In fact, Sham's heart was reported to be the second largest equine heart on record with Secretariat's being the first.