(0 'Root' = 
  {
    (0 'part' = 
      (0 'one' = 
        (0 'a1' = [a])
        (1 'a2' = [bb])
        (2 'a3' = [ccc])
      )
      (1 'two' = 
        (0 'b1' = [d])
        (1 'b2' = [ee])
        (2 'b3' = [fff])
      )
    )
    (0 'part' = 
      (0 'one' = 
        (0 'a1' = [1])
        (1 'a2' = [2])
        (2 'a3' = [3])
      )
      (1 'two' = 
        (0 'b1' = [4])
        (1 'b2' = [5])
        (2 'b3' = [6])
      )
    )
  }
)