4B [Scope of Convention (issues excluded): set-off];

26A1 [Effective declaration of avoidance: notice to other party required];

64A1 ; 64A21 [Seller's right to avoid contract (grounds for avoidance): fundamental breach; Buyer does not pay or take delivery within an additional period set by the seller under art. 63];

74C [Damages (other issues): attorneys' fees]

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