A partner cannot contract himself out of which of the following duties? (1) Duty of utmost good faith, i.e. uberrimae fidei. (2) Duty of carry on business to greatest common advantage. (3) Duty to render true accounts and full information. (4) Duty to indemnify for fraud. (5) Duty to indemnify for willful neglect. (6) Duty to properly use the firm's property.