create table middle_table4 (
       middle4_id integer not null,
        dest4_id1 integer not null,
        dest4_id2 integer not null,
        dest4_id3 integer not null,
        main_id1 integer not null,
        main_id2 integer not null,
        primary key (main_id2, main_id1, dest4_id1, dest4_id2, dest4_id3)
    )