OrderBy(Project(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?mind, SAMPLE,
                                              {},
                                              G1=Group((?mind),
                                                 BGP( ?s (<http://www.w3.org/ns/oa#hasBody>/<http://purl.org/net/ns/ext/maro#mind>) ?mind))),
                                              Aggregation(??agg2: ?mind, COUNT,
                                              {}, G1)),
                              ?mind,
                              ??agg1),
                       ?count,
                       ??agg2),
                {?mind, ?count}), (desc (?count)))