OrderBy(Project(Extend(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?g, SAMPLE,
                                                     {},
                                                     G1=Group((?g,
                                                        ?signature),
                                                        Graph(?g,
                                                        BGP( ?s <urn:dydra:state> ?ops .
                                                         ?s <urn:dydra:signature> ?signature)))),
                                                     Aggregation(??agg2: ?signature, SAMPLE,
                                                     {}, G1),
                                                     Aggregation(??agg3: ?s, COUNT,
                                                     {}, G1)),
                                     ?g,
                                     ??agg1),
                              ?signature,
                              ??agg2),
                       ?count,
                       ??agg3),
                {?g, ?signature, ?count}), (desc (?count)))