public object[] RelationshipsUIDs {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();
        }
    }

});