Description
[Note: Each key-value pair must have a unique non-null key, but the value of an association can be any object reference, including a null reference. The System.Collections.IDictionary interface allows the contained keys and values to be enumerated, but it does not imply any particular sort order. System.Collections.IDictionary implementations fall into three categories: read-only, fixed-size, and variable-size. A read-only implementation cannot be modified. A fixed-size implementation does not allow the addition or removal of elements, but it allows the modification of existing elements. A variable-size implementation allows the addition, removal, and modification of elements.]
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