[ Tree (Cell 1:1 3:10 (NodeHeader (HeaderSection 2))) [ Tree (Cell 1:4 1:8 NodePara) [ Tree (Cell 1:4 1:8 (NodeToken (TokenText "sec1"))) [] ] , Tree (Cell 2:3 2:10 (NodeHeader (HeaderSection 1))) [ Tree (Cell 2:5 2:10 NodePara) [ Tree (Cell 2:5 2:10 (NodeToken (TokenText "sub11"))) [] ] ] , Tree (Cell 3:3 3:10 (NodeHeader (HeaderSection 1))) [ Tree (Cell 3:5 3:10 NodePara) [ Tree (Cell 3:5 3:10 (NodeToken (TokenText "sub12"))) [] ] ] ] ]