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Space Balls

D Delete text in the pattern space up to the first newline
N Add a newline to the pattern space, then append the next line of input to the pattern space
P Print out the portion of the pattern space up to the first newline
h Replace the contents of the hold space with the contents of the pattern space
H Append a newline to the contents of the hold space, and then append the contents of the pattern space to that of the hold space
g Replace the contents of the pattern space with the contents of the hold space
G Append a newline to the contents of the pattern space, and then append the contents of the hold space to that of the pattern space
x Exchange the contents of the hold and pattern spaces