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

29A [Parties by agreement may modify or terminate the contract];

46B [Buyer's right to compel performance: requiring delivery of substitute goods];

49A1 [Buyer's right to avoid contract (grounds for avoidance): fundamental breach of contract];

50A [Buyer's right to reduce price for non-conforming goods];

82A1 [Buyer's inability to return goods in same condition: buyer would have right to avoid contract except inability to return goods in same condition]