public Nullable<ResultPath> MaterializePath( 
   long pathIndex
)

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

    await QueuedTask.Run(async () =>
    {
        var ffp_config = new CIMFilteredFindPathsConfiguration();
        ffp_config.Name = "List out FFP Results by Path Length, Min Cost, Max Cost";
        //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($"Paths by length: {path_by_len_indices.Count()}");
            else if (x == 1)
                sb.AppendLine($"Paths by min cost: {path_by_min_cost.Count()}");
            else if (x == 2)
                sb.AppendLine($"Paths 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 g = 0;
                foreach (var rel_group in path.RelationshipGroups)
                {
                    var first_entity = $"({rel_group.FirstEntity.TypeName}:{rel_group.FirstEntity.Uid})";
                    var second_entity = $"({rel_group.SecondEntity.TypeName}:{rel_group.SecondEntity.Uid})";

                    foreach (var relation in rel_group.Relationships)
                    {
                        sb.Append($"  [{g++}] ");
                        var arrow = relation.SameDirectionAsPath ? "->" : "<-";
                        var rel_uid = FormatID(relation.Relationship.Uid.ToString());
                        sb.Append($"{first_entity} '\r\n\t{relation.Relationship.TypeName}:{rel_uid}' {arrow}\r\n" +
                            $"\t\t{second_entity}");
                        sb.Append($" cost: {relation.Relationship.Cost}\r\n");
                    }
                }
            }
        }

    });

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

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

await QueuedTask.Run(async () =>
{
    var ffp_config = new CIMFilteredFindPathsConfiguration();
    ffp_config.Name = "List out FFP Results Origin, Destination, Other Entities";
    //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($"Entities by length: {path_by_len_indices.Count()}");
        else if (x == 1)
            sb.AppendLine($"Entities by min cost: {path_by_min_cost.Count()}");
        else if (x == 2)
            sb.AppendLine($"Entities 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 origin_dest_uids = new List<string>();
            var sep = "";

            sb.Append(" Origin EntitiesUIDs: ");
            foreach (var idx in per.PathsOriginEntitiesUIDsIndexes)
            {
                //See 'List out FFP Results by Path Length, Min Cost, Max Cost' for
  //FormatID method above
                var uid = FormatID(per.EntitiesUIDs[idx].ToString());
                origin_dest_uids.Add(uid);

                var origin =
                    $"{sep}{per.EntityTypeNames[per.EntityTypes[idx]]}:{uid}";
                sep = ", ";
                sb.Append($"{origin}");
            }
            sb.AppendLine("");

            sep = "";
            sb.Append(" Destination EntitiesUIDs: ");
            foreach (var idx in per.PathsDestinationEntitiesUIDsIndexes)
            {
                var uid = FormatID(per.EntitiesUIDs[idx].ToString());
                origin_dest_uids.Add(uid);

                var dest =
                    $"{sep}{per.EntityTypeNames[per.EntityTypes[idx]]}:{uid}";
                sep = ", ";
                sb.Append($"{dest}");
            }
            sb.AppendLine("");

            sep = "";
            var idx2 = 0;
            sb.Append(" Other EntitiesUIDs: ");
            bool wereAnyOthers = false;
            foreach (var raw_uid in per.EntitiesUIDs)
            {
                var uid = FormatID(raw_uid.ToString());
                if (!origin_dest_uids.Contains(uid))
                {
                    var other =
                    $"{sep}{per.EntityTypeNames[per.EntityTypes[idx2]]}:{uid}";
                    sep = ", ";
                    sb.Append($"{other}");
                    wereAnyOthers = true;
                }
                idx2++;
            }
            if (!wereAnyOthers)
                sb.Append(" <<none>>");

            //sb.AppendLine("");

            var entity_str = sb.ToString();
            System.Diagnostics.Debug.WriteLine(entity_str);

            sb.Clear();
            sep = "";
        }
    }

});