Indicate whether each of the following occurrences would qualify as a covered "accident" under the Equipment Breakdown Insurance Coverage Form. If an occurrence would not qualify as a covered accident, explain why. 1) Unburned natural gas exploded in the exhaust flues of the boiler. 2) A flywheel on a machine broke apart from centrifugal force. I 3) A steam boiler cracked from overheating as a result of insufficient water in the boiler. 4) A new steam boiler installed on the insured's premises exploded while undergoing high-pressure testing.