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To decipher: the top line is the default ruler line, which sets your margins.
Immediately below the default ruler line is a command telling the program to use PR.
Below the second ruler line, are three commands controlling placement of the text on the printed page.
Ruler Lines As indicated above, the ruler line in the edit control file controls the left and right margin, placement of tabs, right justification, and other functions.
COL, my ruler line creates 1inch left and right margins and indents five spaces every time I press Enter.
If you need a ruler line to create right justified lines and hanging indentation, you might use the following.
The A" in the middle of the ruler line turns on automatic reformatting and leaves it on.