what is the longest river in north america and which ocean or sea does it flow into?
return north america ;return rivers of #1 ;return longness of #2 ;return #2 where  #3 is highest ;return ocean ;return seas ;return #5 , #6 ;return #7 that #4 flow into ;return #4 , #8
['select', 'project', 'project', 'superlative', 'select', 'select', 'union', 'filter', 'union']