drop table grade_changes;

drop trigger db_class_size on enrollment;
drop function db_class_size();

drop trigger grade_audit on enrollment;
drop function grade_audit();

drop function student_samples2();
drop function student_samples();
drop function two_students();
drop function fact2( integer );
drop function fact1( integer );
drop function student_name( integer );
drop function add( integer, integer );
drop function add10( integer );
drop function hello();