The contract has a value to the end of the day on which the two sides to complete all the obligations of the contract. If the party intends to change any provision of the contract shall require prior notice to the other party in writing from time to time agreed above (send by Email or Fax). And the changes take effect when the consent of both parties. The two sides are not arbitrarily cancel the contract except in cases of force majeure caused by natural disasters, floods, fires, ...
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