| http://www.w3.org/ns/prov#value | - , mob violence or civil disturbance, acts of the Federal government, acts of other parties, inability to procure or a general shortage of labor, equipment or facilities, energy, freight, materials or supplies in the open market, failure of transportation, strikes, walkouts, boycotts, picketing, slow-downs, work stoppages or other labor actions, or delays due to any of the foregoing such causes, an
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