Good students' highlights could be an added value and worth a higher price
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Erasable highlighters
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Heh. I have shelves of notebooks full. But think of the money we could make from those highlighters!
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Also: I'm a bibliophile. There's no way in hell I'd sell my textbooks...I actually buy textbooks for classes I'll never even take.
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You're a kek after my own heart, my dude. Shadilay!

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Umm, pencils?
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Invisible ink but the uv light would get annoying
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Notebooks
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God they definitely should.
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Use cheap, erasable pens, then leave them in a hot car. The heat will cause the ink to fade because the pens are made to erase with friction
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On it
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Coloured tape
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