;
# line # line
<html>  <html>  
<head><title>Text</title></head>  <head><title>Text</title></head> 
<body>  <body>  
  code x  
  code y  
code a  code a  
code b  code b  
code c  code c  
code d   
code e   
code g    
10  </body>  </body> 
11  </html>  10  </html> 
query
  L_LINE L_TXT R_LINE R_TXT SAME
1 1 <html> 1 <html> 1
2 2 <head><title>Text</title></head> 2 <head><title>Text</title></head> 1
3 3 <body> 3 <body> 1
4 . [empty string] 4 code x 0
5 . [empty string] 5 code y 0
6 4 code a 6 code a 1
7 5 code b 7 code b 1
8 6 code c 8 code c 1
9 7 code d . [empty string] 0
10 8 code e . [empty string] 0
11 9 code g . [empty string] 0
12 10 </body> 9 </body> 1
13 11 </html> 10 </html> 1