query: SELECT DISTINCT ?item ?constituency ?group ?start ?end ?election ?cause WHERE {
    ?item p:P39 ?stmt;
      wdt:P31 wd:Q5.
    ?stmt ps:P39 wd:Q4416090;
      pq:P2937 wd:Q4641992.
    OPTIONAL { ?stmt pq:P768 ?constituency. }
    OPTIONAL { ?stmt pq:P4100 ?group. }
    OPTIONAL { ?stmt pq:P580 ?start. }
    OPTIONAL { ?stmt pq:P582 ?end. }
    OPTIONAL { ?stmt pq:P2715 ?election. }
    OPTIONAL { ?stmt pq:P1534 ?cause. }
  }