public ulong[] RelationshipsFrom {get;}

{
  //using ArcGIS.Core.Data.Knowledge.Extensions;

  await QueuedTask.Run(async () =>
  {
    var ffp_config = new CIMFilteredFindPathsConfiguration();
    ffp_config.Name = "List out FFP Results Relationships";
    //set up config
    //...

    var results = kg.RunFilteredFindPaths(ffp_config);

    if (results.CountPaths == 0)
    {
      System.Diagnostics.Debug.WriteLine("FFP returned no paths");
      return;
    }

    //print out paths by increasing length, min cost, max cost
    var path_by_len_indices = (IEnumerable<long>)results.PathIndicesOrderedByIncreasingPathLength
                                .Select(idx => idx.index);
    var path_by_min_cost = (IEnumerable<long>)results.PathIndicesOrderedByIncreasingMinPathCost
                                .Select(idx => idx.index);
    var path_by_max_cost = (IEnumerable<long>)results.PathIndicesOrderedByIncreasingMaxPathCost
                                .Select(idx => idx.index);

    var x = 0;
    StringBuilder sb = new StringBuilder();

    foreach (var path_indeces in new List<IEnumerable<long>> {
    path_by_len_indices,
    path_by_min_cost,
    path_by_max_cost})
    {
      if (x == 0)
        sb.AppendLine($"Relationships by length: {path_by_len_indices.Count()}");
      else if (x == 1)
        sb.AppendLine($"Relationships by min cost: {path_by_min_cost.Count()}");
      else if (x == 2)
        sb.AppendLine($"Relationships by max cost: {path_by_max_cost.Count()}");
      x++;
      foreach (var path_idx in path_indeces)
      {
        var path = (ResultPath)results.MaterializePath(path_idx);
        sb.AppendLine(
          $"Path[{path_idx}] length: {path.Length}, min: {path.MinCost} max: {path.MaxCost}");

        var sorted_set = new SortedSet<ulong>();
        sorted_set.Add((ulong)path_idx);
        var per = results.ExtractPathsEntitiesAndRelationships(sorted_set);

        var idx = 0;
        foreach (var rel_uid in per.RelationshipsUIDs)
        {
          sb.Append($" RelationshipsUIDs[{idx}]: ");

          var uid = FormatID(rel_uid.ToString());
          var rel_info =
            $"{per.RelationshipTypeNames[per.RelationshipTypes[idx]]}:{uid}";
          sb.Append($"{rel_info}\r\n");
          //From entity:
          var entity_idx = per.RelationshipsFrom[idx];
          var origin_uid = FormatID(per.EntitiesUIDs[entity_idx].ToString());
          var origin = $"{per.EntityTypeNames[per.EntityTypes[entity_idx]]}:{origin_uid}";
          sb.Append($"   RelationshipsFrom: {origin}\r\n");
          //To entity
          entity_idx = per.RelationshipsTo[idx];
          var dest_uid = FormatID(per.EntitiesUIDs[entity_idx].ToString());
          var dest = $"{per.EntityTypeNames[per.EntityTypes[entity_idx]]}:{dest_uid}";
          sb.Append($"   RelationshipsTo: {dest}\r\n");
          idx++;
        }

        var rel_str = sb.ToString();
        System.Diagnostics.Debug.WriteLine(rel_str);
        sb.Clear();
      }
    }

  });
}

string FormatID(string id)
{
  id = id.ToUpperInvariant();
  if (!id.StartsWith('{'))
    id = '{' + id;
  if (!id.EndsWith('}'))
    id += '}';
  return id;
}