“…Example 3. For R ∼ = Z 30 × Z 3 and I ∼ = 0 × Z 3 , we can separate Z I (R, 3) into 3 partite sets V 1 = (2, 0), (2, 1), (2, 2), (4, 0), (4, 1), (4, 2), (8, 0), (8,1), (8,2), (14, 0), (14,1), (14,2), (16,0), (16,1), (16,2), (22,0), (22,1), (22,2), (26, 0), (26, 1), (26, 2), (28, 0), (28, 1), (28, 2) , V 2 = (3, 0), (3,1), (3,2), (9, 0), (9, 1), (9,2), (21,0), (21,1), (21,2), (27, 0), (27, 1), (27,2)…”