I haven't figured out one yet, alas! I suspect my teachers would have said the same thing, if they'd known about it back when I was a student though *g*
I used to love erasable ballpens, probably because I couldn't use them, but they had a huge problem: the ink takes a bit more time to dry than usual pens, so if you accidentally put you hand on the still wet text, you'll wipe it all away ;A;
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