select ?x ?y ?z where
{
?x <rdf:type> <ub:UndergraduateStudent>.
?y <rdf:type> <ub:FullProfessor>.
?z <rdf:type> <ub:Course>.
?x <ub:advisor> ?y.
?x <ub:takesCourse> ?z.
?y <ub:teacherOf> ?z.
}