Add a Set to this composite
@param c Must implement Set
@throws IllegalArgumentException if c does not implement java.util.Setor if a SetMutator is set, but fails to resolve a collision
@throws UnsupportedOperationException if there is no SetMutator set, ora CollectionMutator is set instead of a SetMutator
@see org.apache.commons.collections.collection.CompositeCollection.CollectionMutator
@see SetMutator
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