Lines
[RETURN]	First non-blank character of next line
0, $	First, last position of current line
^	First non-blank character of current line
+, -	First non-blank character of next, previous line
n|	Column n of current line
H	Top line of screen
M	Middle line of screen
L	Last line of screen
nH	n (number) of lines after top line
nL	n (number) of lines before last line