If you're adding a lot of length or want a full look, I wouldn't leave any spaces between the rows or between the connections. If you're just adding some volume to already-long hair, leaving spaces is probably a good idea. So it depends. Assuming it's the former, particularly on the bottom rows, you should do all the hair; you may want to make the connections or rows a bit sparser on the top, though, so there isn't a definitive "line" where the extensions begin.
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