Lambda1___B_is_Lambda1+Lambda2 2 2 Lambda2 -2 0 the_lattice_point_paired_with_0 0 0 the_lattice_point_paired_with_Lambda1 2 2 the_lattice_point_paired_with_2Lambda1 4 4 the_lattice_point_paired_with_Lambda2 -1 0 the_lattice_point_paired_with_Lambda1+Lambda2 1 1 the_lattice_point_paired_with_2Lambda1+Lambda2 3 4