Lambda1___B_is_Lambda1 21 21 Lambda2 -1 0 the_lattice_point_paired_with_0 1 1 the_lattice_point_paired_with_Lambda1 21 21 the_lattice_point_paired_with_2Lambda1 41 41 the_lattice_point_paired_with_Lambda2 -1 0 the_lattice_point_paired_with_Lambda1+Lambda2 20 21 the_lattice_point_paired_with_2Lambda1+Lambda2 41 42