| Interface | Description | 
|---|---|
| QuorumVerifier | 
 All quorum validators have to implement a method called
 containsQuorum, which verifies if a HashSet of server 
 identifiers constitutes a quorum. 
 | 
| Class | Description | 
|---|---|
| QuorumHierarchical | 
 This class implements a validator for hierarchical quorums. 
 | 
| QuorumMaj | 
 This class implements a validator for majority quorums. 
 | 
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