/* 
 * 
 *
 * 
 */

create table prereq3 (
        course          int         not null,
        prereq          int         not null,
    primary key (course, prereq)
) ;


insert into prereq3
(course, prereq)
values
(140,131),(140,132),
(150,141),(150,142),
(160,151),(160,152),
(170,161),(170,162),
(180,160),(180,170),
(155,150),(155,140),
(200,180),(200,155),
(220,200),
(230,220),
(240,230),(250,230),
(260,240),(270,250),
(131,270)
;