6A [Exclusion or modification of Convention by contract];

7A3 [Principles of interpretation: observance of good faith];

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

11A [Writing or other formality for conclusion of contract];

18A [Criteria for acceptance: conduct indicating assent];

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

57A [Place for payment: in absence of agreement, payment at seller's place of business];

84A [Restitution of benefits received: seller bound to refund price must pay interest]