text: select t.n_nationkey, t.name, t.n_regionkey, t.n_comment
  from (
    select n_nationkey, n_name as name, n_regionkey, n_comment
    from nation n
    join region r on (n.n_regionkey = r.r_regionkey)
  ) t
  join supplier s on (s.s_nationkey = t.n_nationkey)
  where t.name = 'MOROCCO';
  