7A3 [Observance of good faith];

8A ; 8B ; 8C [Interpretation of party's statements or other conduct: intent of party making statement or engaging in conduct; Interpretation based on objective standards; Interpretation in light of surrounding circumstances];

14A [Criteria for an offer (basic criteria): definiteness of key conditions, intention to be bound in case of acceptance];

18A [Criteria for acceptance of offer];

19C [Acceptance with modifications: modifications that are material]