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C# C# Collections Lists Lists

Not sure how to structure the exercise.

I'm not sure how to structure this. I have reviewed the videos and this doesn't make sense to me. Any guidance is appreciated.

using System.Collections.Generic;

namespace Treehouse.CodeChallenges
    public static class MathHelpers

        List<int> GetPowersOf2 = new List<int> () { (int)System.Math.Pow( 2, 2 ) }