25B [Definition of fundamental breach (substantial deprivation of expectation, etc.): foreseeability test];

47A [Buyer's notice fixing additional final period for performance];

49A [Buyer's right to avoid contract: grounds for avoidance];

64A [Seller's right to avoid contract: grounds for avoidance]:

74A [General rules for measuring damages: loss suffered as consequence of breach];

75A [Damages established by substitute transaction: substitute transaction after avoidance];

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

78A [Interest on delay in receiving sum in arrears];

84A [Restitution of benefits received: seller bound to refund price must pay interest]