Thought Migrations

I am taking a class in Non-Linear Spellcasting. We should have gone on to more advanced topics in the class this month, but the numbers 2³² through 2⁴⁴ launched a magical freezing attack on the academy yesterday, causing many of the pipes to burst. The academy has recruited all the upper division classes to repair pipes all over campus. Instead of learning more advanced non-linear spellcasting techniques, we are using our crab constructs to inspect the damage.

I am ankle deep in crab constructs. Help!

How do I make the backspace button work..............?