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* `App.update(dt)` -- called after every call to `App.draw`. Make changes to
  your app's variables here rather than in `App.draw`. Provides in `dt` the
  time since the previous call to `App.update`, which can be useful for things
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* `App.mousereleased(x,y, mouse_button)` -- called when you release a mouse
  button. Provides the same arguments as `App.mousepressed()` above.
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* `App.keyreleased(key)` -- called when you press a key on the keyboard.
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