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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Please, check JS. 2nd & 4th tests - point lies on the border. 6th test - point is obviously outside.
"In the tests, the point will never fall exactly on an edge of the polygon". As far as I see, it's not true.
Moreover, when in the tests point is on an edge, answer differs (in 2nd test is true, in 4th - false).