Does George RR Martin know the ending?

Related questions

1. Is George RR Martin writing the prequel?
2. Is George RR Martin finished Game of Thrones?
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4. Does George RR Martin like the end of Game of Thrones?
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Tags

1. #thrones
2. #books
3. #martin
4. #based
5. #which
6. #release
7. #winter
8. #since
9. #george
10. #without
11. #acclaimed
12. #working
13. #sight
14. #winds
15. #ending
16. #author
17. #series