8C [Interpretation of party's statements or other conduct: interpretation in light of surrounding circumstances];

9C [Practices established by the parties];

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

51A [Buyer's rights: delivery or non-conformity of only part of goods];

76B [Avoidance: damages recoverable based on current price];

80A [Failure of performance caused by other party (party causing non-performance): loss of rights]