namespace System { public struct ValueTuple<T1, T2, T3> : IStructuralComparable, IStructuralEquatable, IComparable, IComparable<(T1, T2, T3)>, IEquatable<(T1, T2, T3)> { public T1 Item1; public T2 Item2; public T3 Item3; public ValueTuple(T1 item1, T2 item2, T3 item3); public int CompareTo((T1, T2, T3) other); public bool Equals((T1, T2, T3) other); } }