code: def AchillesHeel(*xs, simplify=True):
      r
      nargs = len(xs)
      if nargs & 1:
          fstr = "expected an even number of arguments, got {}"
          raise ValueError(fstr.format(nargs))
      xs = [Expression.box(x).node for x in xs]
      y = exprnode.and_(*[exprnode.or_(xs[2*i], xs[2*i+1])
                          for i in range(nargs // 2)])
      if simplify:
          y = y.simplify()
      return _expr(y)
docs: r"""
      Return the Achille's Heel function, defined as:
      :math:`\prod_{i=0}^{n/2-1}{X_{2i} + X_{2i+1}}`.
  
      If *simplify* is ``True``, return a simplified expression.