11.   In the early days of archaeology, the dividing line between archaeologists and treasure hunters was all but invisible.

12.   Insert three blank lines between the date and the body of the letter.

13.   Leave three blank lines between the date and the body of the letter.

14.   Marriage teeters on the line between a cooperative venture and a form of mutual exploitation-ask any divorce lawyer.

15.   Neither of these approaches necessitate the drawing of precise lines between legal and factual questions.

16.   Once the line between the conventional primary source and the secondary study is crossed, the flood is even worse.

17.   Once this fall was likened to a gigantic weir, its crest a straight line between Goat Island and the opposite shore.

18.   One must insist on this clear dividing line between the two stages of writing.

19.   One of the most important consequences of the war was the hardening of ideological and political lines between North and South.