SWIFT playgrounds, how to Code 2, build a loop, I can not find isOnGem

Swift playgrounds, how to Code 2, build a loop, I can not all isOnGem. What Miss me? If I am not mistaken, is it a bug? How should I declare?

I can't figure out how to solve the puzzle without this.

isOnGem is not available as an option in the box to scroll so just type in from the table instead. If you enter exactly the same case, it will be recognized as legal code when you run your program.

Tags: iPad

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