Faire tous les cas de figures
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Tester toutes les multiplications possibles
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 .. code-block:: python

  >>> from itertools import permutations
  >>> coefs_p = [[(i-2),(j-2)] for i,j in permutations(range(5),2)] 
  >>> coefs_q = [[2*(i-2),2*(j-2)] for i,j in permutations(range(5),2)] 
  >>> l_p = [Polynom(i) for i in coefs_p]
  >>> l_q = [Polynom(i) for i in coefs_q]
  >>> operations = [Expression([l_p[i],l_q[j],op.mul]) for i,j in permutations(range(len(coefs_p)),2)]
  >>> for i in operations:
  ...   print(i)