???????? WHAT??????

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Are You A Zombie?

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• thumb_up thumb_down +35

  ???????? WHAT??????

• thumb_up thumb_down +11

  They've listed both in each answer, and then drawn a 'swap these' arrow

• thumb_up thumb_down +8

  i dont get it >_>

• thumb_up thumb_down +3

  H2O = Hydrogen Dioxide right? thereore the teacher fixed a mistake that wasnt even there.