Answer:
Spotting errors as you proofread is easier if you use a clean printed copy each time.
Step-by-step explanation:
It is recommendable and easier to find and correct the mistakes in a piece of work if after every revision we print a clean copy of it and proofread it again. We must consider that there are several kinds of mistakes than have to be analyzed, it is also recommendable to analyze only one kind of mistake in every revision.