def other_watch(self, literal):
        if self._watch1 == literal:
            return self._watch2
        else:
            return self._watch1
Parse 'aux' command  for simple, cloned, or conditional aux of forms
dataset/ETHPy150Open enthought/depsolver/depsolver/solver/rules_watch_graph.py/RuleWatchNode.other_watch--crossover with--dataset/ETHPy150Open ioflo/ioflo/ioflo/base/building.py/Builder.buildAux