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The following are requirements to prove a unilateral mistake except $-$

a$.$ The mistake has to be one that is done on purpose by one party and by accident by the other.

b$.$ The mistaken party is not at fault

c$.$ One party is mistaken as to a term of the contract, and would not have entered the contract but for this mistake

d$.$ The mistake is known or reasonably ought to be known to the other party