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It's easy to losing a highlighter, Wite-Out, etc. Why not make a combo-tool shaped like a big plus cross? So you have a pen and connected to it at a 90 degree angle is a highlighter. The Wite-Out is also connected. Maybe even attach a one-hole hole-puncher for good luck.

So if I'm writing, I can flip the thing easy in my hand and highlight, correct, etc.

Reward: A sample of it.
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