1. Prove that the lawyer's seal and signature are valid. If the parties conclude a contract in the form of a contract, the contract shall be established when the parties sign, seal or fingerprint it.

2. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

3. A contract shall be concluded in written form as stipulated by laws and administrative regulations or agreed by the parties. If the parties have not agreed in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.