Slice(OrderBy(Project(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?type, SAMPLE,
                                                    {},
                                                    G1=Group((?type),
                                                       Filter((?type != <http://dbpedia.org/resource/Paper>),
                                                       BGP( ?main <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://w3id.org/prohow#instruction_set> .
                                                        ?other_req <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?type .
                                                        ?main <http://w3id.org/prohow#requires> ?other_req .
                                                        ?requirement <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/resource/Paper> .
                                                        ?main <http://w3id.org/prohow#requires> ?requirement)))),
                                                    Aggregation(??agg2: ?other_req, COUNT,

                                                    <KEYWORD/DISTINCT>, G1)),
                                    ?type,
                                    ??agg1),
                             ?no,
                             ??agg2),
                      {?type, ?no}), (desc (?no))),
      0,
      20)