@classmethod
def get_conditional_uni(cls, left_parent, right_parent):
    """Identify pair univariate value from parents.

        Args:
            left_parent (Edge):
                left parent
            right_parent (Edge):
                right parent

        Returns:
            tuple[np.ndarray, np.ndarray]:
                left and right parents univariate.
        """
    left, right, _ = cls._identify_eds_ing(left_parent, right_parent)
    left_u = left_parent.U[0] if left_parent.L == left else left_parent.U[1]
    right_u = right_parent.U[0] if right_parent.L == right else right_parent.U[
        1]
    return left_u, right_u
