| http://www.w3.org/ns/prov#value | - chanical difficulties, fires, explosions, equipment failures or accidents, including ruptures of pipelines or train derailments;???political events, public protests, civil disturbances, terrorist acts or cyber attacks;???decreases in crude oil and natural gas prices;???limited availability of financing with acceptable terms;???title problems;???environmental hazards, such as uncontrollable flows o
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