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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.
Get started now by creating a new collection.
Yes you are indeed modifying the input, read this for more info
I am afraid no. It is about the automatic tests and not the ones under control during programming.
Are you modifying the input?
There seems to be a bug for the Javascript-version. The following test case I randomly got is wrong, apparently:
assert.deepEqual(symmetricPoint([340, -634], [162, 809]), [340, -634]);
Could you check please?
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Several numbers in your list are not prime ;)
Description says: the numbers are in the range (1 ≤ a, b, c ≤ 10).