Conflict-Free Replicated Data Types (CRDTs) allow objects to be replicated and concurrently modified without coordination. CRDTs solve conflicts automatically and provide eventual consistency. Typically each CRDT uses a specific policy for solving conflicts. For example, in an add-wins set CRDT, when an element is concurrently add and removed in different replicas, priority is given to add, i.e., the element stays in the set. Unfortunately, this may be inadequate for some applications - it may be desired to overrule the default policy for some operation executions. For example, an application using an add-wins set may want some removes to win over concurrent adds. This paper present the design of a set CRDT that implements such semantics.

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