Is George RR Martin finished Game of Thrones?

Related questions

1. How much does George RR Martin make?
2. Does George RR Martin know the ending?
3. Is George RR Martin writing the prequel?
4. Does George RR Martin like the end of Game of Thrones?
5. Is George RR Martin a producer on Game of Thrones?
6. Will Game of Thrones end after season 8?

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