For which product was there a problem reported by Christop Berge, with closure authorised by Ashley Medhurst? Return the product ids.
return products ;return problems of  #1 ;return #2 reported by Christop Berge ;return closures of  #1 ;return #4 authorised by Ashley Medhurst ;return #1 of  both #3 and #5 ;return product ids of  #6
['select', 'project', 'filter', 'project', 'filter', 'intersection', 'project']