1 0 10 doc 0 0 2 0 1 doc 0 0 3 1 1 a 0 0 4 2 3 #text 0 1 This 5 1 15 a 0 0 6 1 1 b 0 0 7 2 3 #text 0 1 is a valid 8 1 15 b 0 0 9 1 1 a 0 0 10 2 3 #text 0 1 document 11 1 15 a 0 0 12 0 15 doc 0 0 13
