25B [Fundamental breach (definition of): substantial deprivation of expectation, etc.];

35A ; 35B [Conformity of goods: quality, quantity and description required by contract; Requirements implied by law];

47A [Notice fixing additional final period for performance: buyer's right to fix additional period for performance];

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

84A [Seller bound to refund price must pay interest]