For given current injections, generate all possible voltage dipoles
        with skip **skip**.

        Parameters
        ----------
        cinj : :py:class:`numpy.ndarray`
            Nx2 array containing the current injection electrodes a,b
        skip : int, optional
            Skip used for voltage electrodes. Default: 0

def gen_voltage_dipoles_skip(self, cinj, skip=0):
        """For given current injections, generate all possible voltage dipoles
        with skip **skip**.

        Parameters
        ----------
        cinj : :py:class:`numpy.ndarray`
            Nx2 array containing the current injection electrodes a,b
        skip : int, optional
            Skip used for voltage electrodes. Default: 0

        """
        new_configs = []
        for ab in cinj:
            for i in range(1, self.nr_electrodes + 1):
                m = i
                n = i + skip + 1
                if m in ab or n in ab:
                    continue
                if n > self.nr_electrodes:
                    continue
                new_configs.append((ab[0], ab[1], m, n))
        configs = np.array(new_configs)
        self.add_to_configs(configs)
        return configs