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diff --git a/src/mscorlib/shared/System/Collections/Generic/ICollection.cs b/src/mscorlib/shared/System/Collections/Generic/ICollection.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Diagnostics.Contracts;
+
+namespace System.Collections.Generic
+{
+ // Base interface for all collections, defining enumerators, size, and
+ // synchronization methods.
+ public interface ICollection<T> : IEnumerable<T>
+ {
+ // Number of items in the collections.
+ int Count { get; }
+
+ bool IsReadOnly { get; }
+
+ void Add(T item);
+
+ void Clear();
+
+ bool Contains(T item);
+
+ // CopyTo copies a collection into an Array, starting at a particular
+ // index into the array.
+ //
+ void CopyTo(T[] array, int arrayIndex);
+
+ //void CopyTo(int sourceIndex, T[] destinationArray, int destinationIndex, int count);
+
+ bool Remove(T item);
+ }
+}