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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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This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
I think what it's trying to say is that you have the lowest possible value of the range, which it refers to as 'begin'. This begin is the first number in the sequence. Then you have the highest possible value in the range, which they call 'end'. This is the second number in the sequence. Then they say the third number is called the 'step'. Its pretty much just how much you jump from number to number by. Lets say we have a sequence 1, 4, 2. The lowest possible value (which is also the number we start at) is 1, while 4, the second value, is the highest possible number we can go to. Then we have 2. Put it simply, 2 is the number we count by. So for this sequence, the answer would be 1, 1+2(3), 3+2(5) oops, 5 is higher than 4! So 1 + 1+2(3) = 4 would be the answer for the sequence 1, 4, 2. Hope this helps!