Assertion: fence | /r/HasProperty | built along one-third of the border
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Source sentences:
text: almost 2,000 miles.﻿﻿ Walls, fences, and virtual walls of sensors and cameras monitored by the U.S. Border Patrol are already built along one-third of the border (approximately 650 miles) to secure the border and cut down on illegal immigration.﻿﻿