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def shrink():
  pic = getPic()
  newpic =  makeEmptyPicture(getWidth(pic)/2, getHeight(pic)/2)
  for x in range(0, getWidth(pic), 2):
    for y in range(0, getHeight(pic), 2):
      color = getColor(getPixel(pic, x, y))
      setColor(getPixel(newpic, x/2, y/2), color)
  show(newpic)