docs: def clampings_iter(self, cues=None):
          """
          Iterates over all possible clampings of this experimental setup
  
          Parameters
          ----------
          cues : Optional[iterable]
              If given, restricts clampings over given species names
  
  
          Yields
          ------
          caspo.core.clamping.Clamping
              The next clamping with respect to the experimental setup
          """
          s = cues or list(self.stimuli + self.inhibitors)
          clampings = it.chain.from_iterable(it.combinations(s, r) for r in xrange(len(s) + 1))
  
          literals_tpl = {}
          for stimulus in self.stimuli:
              literals_tpl[stimulus] = -1
  
          for c in clampings:
              literals = literals_tpl.copy()
              for cues in c:
                  if cues in self.stimuli:
                      literals[cues] = 1
                  else:
                      literals[cues] = -1
  
              yield Clamping(literals.iteritems())