A miserable 6 for me:
2y
2g
2g
2g
2g 1y
5g
I thought about my sixth guess on and off for five hours, but just couldn't see the answer. Then I went for a swim and the answer came to me before I'd finished my first length of the pool.
2y
2g
2g
2g
2g 1y
5g
I thought about my sixth guess on and off for five hours, but just couldn't see the answer. Then I went for a swim and the answer came to me before I'd finished my first length of the pool.

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