/* 
 * 
 *
 * 
 */

create table prereq2 (
        course          int         not null,
        prereq          int         not null,
    primary key (course, prereq)
) ;


insert into prereq2
(course, prereq)
values
(353, 271), (353, 281),
(271, 170),
(281,150), (281,170), (281,271),
(170,150), (170,317),
(317,250),
(343,271),
(460,343), (460,353), (460,313),
(313,170),(313, 271)
;