Project(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?gametype, COUNT,
                                                  {},
                                                  G1=Group((?s),
                                                     BGP( ?s <https://www.analoggamemuseum.org/ontology/gameType> ?gametype))), 
                                      Aggregation(??agg2: ?s, SAMPLE, {}, G1)),
                      ?count,
                      ??agg1),
               ?s,
               ??agg2),
        {?count, ?s})