1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

0 10 doc 0 0
0 1 doc 0 0
1 1 a 0 0
2 3 #text 0 1 This
1 15 a 0 0
1 3 #text 0 1  is a 
1 1 b 0 0
2 3 #text 0 1 valid
1 15 b 0 0
1 3 #text 0 1  document
0 15 doc 0 0