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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def sorted_product_set(array_a, array_b):
 """Compute the product set of array_a and array_b and sort it."""

  return np.sort(
      np.concatenate(
          [array_a[i] * array_b for i in xrange(len(array_a))], axis=0)
  )[::-1]