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1-In this line of work, pencil is better than pen because you can erase what you have written. 2-In this line of work, the pencil is better than the pen because you can erase what you have written. 3-In this line of work, pencils are better than pens because you can erase what you have written.
1-In this line of work, pencil is better than pen because you can erase what you have written. 2-In this line of work, the pencil is better than the pen because you can erase what you have written. 3-In this line of work, pencils are better than pens because you can erase what you have written.
They are all correct, but #1 is the one you will most likely hear.
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