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create table streets ( id int primary key auto_increment, name varchar(64) ); create table crossroads ( id int primary key auto_increment, name varchar(64) ); create table streets_crossroads ( street_id int, crossroad_id int, primary key (street_id, crossroad_id), foreign key (street_id) references streets(id), foreign key (crossroad_id) references crossroads(id) );

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