Dense [1:5]
│ 
├─[1]:
│ SparseList (0.0) [1:10]
│ │ 
│ └─[1] [3] [4] [6] [7] [9] [10]
│   2.0 1.0 2.0 1.0 2.0 1.0 2.0 
│ 
├─[2]:
│ SparseList (0.0) [1:10]
│ │ 
│ └─[2] [3] [5] [6] [8] [9]
│   1.0 2.0 1.0 2.0 1.0 2.0
│ 
├─[3]:
│ SparseList (0.0) [1:10]
│ │ 
│ └─[1] [2] [4] [5] [7] [8] [10]
│   1.0 2.0 1.0 2.0 1.0 2.0 1.0 
│ 
├─[4]:
│ SparseList (0.0) [1:10]
│ │ 
│ └─[1] [3] [4] [6] [7] [9] [10]
│   2.0 1.0 2.0 1.0 2.0 1.0 2.0 
│ 
├─[5]:
│ SparseList (0.0) [1:10]
│ │ 
│ └─[2] [3] [5] [6] [8] [9]
│   1.0 2.0 1.0 2.0 1.0 2.0

