( aar
      (bar1 1 2 3)
      (bar2 1 2 3)
      (bar3 
         (car1 2 3)
         (car2)
         (car3)
      )
    )

(aar (bar1 1 2 3) (bar2 1 2 3) (bar3 (car1 2 3)(car2)(car3)))