Assertion: tour de france's leader | /r/HasProperty | nairo quintana
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Source sentences:
text: In stage eight, the Tour's first mountain stage, which ended at the Ax 3 Domaines, Froome attacked a select five-rider group, which included Alberto Contador and Alejandro Valverde, as they passed the lone leader Nairo Quintana with 5 km (3.1 mi) remaining.