code: private Set<TableEntry> search(final ProtoNetwork pn, String... literals) {
          Set<TableEntry> ret;
          if (noItems(literals)) {
              return emptySet();
          }
  
          // An initial capacity would be ideal for this set, but we don't
          // have any reasonable estimations.
          ret = new HashSet<TableEntry>();
  
          // Establish access to the relevant table objects
          final ParameterTable paramTbl = pn.getParameterTable();
          final TermTable termTbl = pn.getTermTable();
          final List<String> terms = termTbl.getTermValues();
          final NamespaceTable nsTbl = pn.getNamespaceTable();
  
          final int[][] indata = pn.getTermIndices();
  
          final Set<String> literalSet = constrainedHashSet(literals.length);
          for (final String s : literals) {
              literalSet.add(s);
          }
  
          // Search indata for elements of the term literal set
          for (int i = 0; i < indata.length; i++) {
              int tid = indata[i][TERM_INDEX];
              String string = terms.get(tid);
              if (!literalSet.contains(string)) {
                  continue;
              }
  
              int pid = indata[i][PARAM_INDEX];
              final TableParameter tp = paramTbl.getTableParameter(pid);
  
              final String inval = tp.getValue();
              int nid = indata[i][NAMESPACE_INDEX];
  
              final TableNamespace tns = nsTbl.getTableNamespace(nid);
              String inrl = null;
              if (tns != null) inrl = tns.getResourceLocation();
  
              final TableEntry te = new TableEntry(inval, inrl);
              ret.add(te);
          }
  
          return ret;
      }
docs: Aggregate the set of all table entries for a proto-network that match at
  least one of the provided term literals.
  
  @param literals Literals, e.g., {@code proteinAbundance(#)}
  @return Table entry set