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    Method type should be "bool" not "Boolean"

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    "sum_of_n (or SequenceSum.sumOfN in Java, SequenceSum.SumOfN in C#) takes an integer n and returns a List (an Array in Java/C#) of length abs(n) + 1."

    Pretty much the whole thing but the above really threw me! I think it's me just getting freaked out by all of the maths involved.

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    I struggled to understand the instructions.