DELETING LINES

If you want to delete a whole line, you could delete a character at a time
by pressing Del over and over.  But there's an easier way: use ALT-d.
Try it!

If you delete a line by mistake you can "undo" the damage with ALT-u.  You
can think of ALT-d and ALT-u as opposites.  Try to undo the deletions you
just made.  Then delete them again, and undo them again, and ...

Enough of this game ... onward with F1 ...

DU