25B [Definition of fundamental breach: substantial deprivation of expectations, etc.];

75A1 ; 75B1 [Damages established by substitute transaction after avoidance: resale by aggrieved seller; Relationship between avoidance and substitute transaction: reasonable substitute transaction];

77A [Obligation to take reasonable measures to mitigate damages];

79B ; 79E [Impediments excusing party from damages; Notice of impediment]