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Which sentence demonstrates incorrect punctuation?
1) I have lived in Los Angeles, California; New Orleans, Lousiana; Evanston, Illinois; and Portland, Oregon.
2) Lian sharpened her pencil, and sat down to write.
3) I have a cat; therefore, I have cat hair on my clothes most of the time.
4) Please use this on the test: a number two pencil.
What is
2) Lian sharpened her pencil, and sat down to write.