The performance of a party to a contract for the sale of goods will be excused on the ground of commercial impracticability only if

the contingency was unforeseeable and would not normally have been contemplated by the parties.

the contingency was both foreseeable and readily avoidable.

a war breaks out.

the seller's performance has become commercially impracticable because of unforeseen supervening circumstances not within the contemplation of the parties at the time of contracting.

the unforeseeable contingency was foreseen.