1 [ Tree (Cell 1:1 3:8 (NodeHeader (HeaderSection 1)))
2 [ Tree (Cell 1:3 1:7 NodePara)
3 [ Tree (Cell 1:3 1:7 (NodeToken (TokenText "sec1"))) []
5 , Tree (Cell 2:1 2:8 (NodeHeader (HeaderSection 2)))
6 [ Tree (Cell 2:4 2:8 NodePara)
7 [ Tree (Cell 2:4 2:8 (NodeToken (TokenText "sec2"))) []
10 , Tree (Cell 3:1 3:8 (NodeHeader (HeaderSection 2)))
11 [ Tree (Cell 3:4 3:8 NodePara)
12 [ Tree (Cell 3:4 3:8 (NodeToken (TokenText "sec3"))) []