Assertion: jockey's horse | /r/CapableOf | excel at particular distance
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Source sentences:
text: American Thoroughbred races are run at a wide variety of distances, most commonly from 5 to 12 furlongs (0.63 to 1.50 mi; 1.0 to 2.4 km); with this in mind, breeders of Thoroughbred race horses attempt to breed horses that excel at a particular distance (see dosage index).