code: def neclusters(l, K):
      
      for c in clusters(l, K):
          if all(x for x in c):
              yield c
docs: Partition list ``l`` in ``K`` partitions, without empty parts.
  
      >>> l = [0, 1, 2]
      >>> list(neclusters(l, 2))
      [[[0, 1], [2]], [[1], [0, 2]], [[0], [1, 2]]]
      >>> list(neclusters(l, 1))
      [[[0, 1, 2]]]