code: public static Collection<Set<ProposalResponse>> getProposalConsistencySets(Collection<ProposalResponse> proposalResponses
      ) throws InvalidArgumentException {
  
          return getProposalConsistencySets(proposalResponses, new HashSet<ProposalResponse>());
  
      }
docs: Check that the proposals all have consistent read write sets
  
  @param proposalResponses
  @return A Collection of sets where each set has consistent proposals.
  @throws InvalidArgumentException