Assertion: gridlock | /r/CapableOf | come in cluster
Facets:
Source sentences:
text: Gridlocks appear to come in clusters: 1789-1797, two of four gridlocked; 1824-1861, six of seventeen gridlocked; 1875-1883, three of four gridlocked; 1887-1931, five of twenty-two; 1981-2013, five of sixteen.