# filename: ex354.rq

PREFIX ab: <http://learningsparql.com/ns/addressbook#>
PREFIX d:  <http://learningsparql.com/ns/data#> 
PREFIX g:  <http://learningsparql.com/graphs/> 

SELECT ?first ?last ?courseTitle WHERE
{

  { GRAPH g:people 
    { ?student ab:firstName ?first ;
               ab:lastName ?last .
    }
  }

  { GRAPH g:enrollment
    { ?student ab:takingCourse ?course . }
  }

  { GRAPH g:courses
    { ?course ab:courseTitle ?courseTitle . }
  }

}