this material includes written documents, witness testimony, material evidence, expert opinions and other relevant documents.

1. written documents: contracts, agreements, reports, memos, letters, etc.

2. Testimony of witnesses: oral statements made by witnesses in court or in mediation, arbitration and other procedures.

3. Physical evidence: photos, videos, recordings, DNA samples, fingerprints, etc.

4. Expert opinion: expert's professional opinion on an event or article.

5. Other relevant documents: financial statements, administrative licenses, patent certificates, trademark registration certificates, etc.