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

26A [Notification of avoidance: effective declaration of avoidance];

47C [Notice fixing additional final period for performance: depending on the facts, not an essential prerequisite for setting the stage for avoidance];

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

51B1 [Non-conformity of part of goods (avoidance as to entire contract): must be based on fundamental breach of contract as a whole]