The balanced incomplete block design D has parameters (6, 10, 5, 3, 2) and blocks B_0 = {0, 1, 2} B_5 = {1, 2, 5} B_1 = {0, 1, 3} B_6 = {1, 3, 4} B_2 = {0, 2, 4} B_7 = {1, 4, 5} B_3 = {0, 3, 5} B_8 = {2, 3, 4} B_4 = {0, 4, 5} B_9 = {2, 3, 5}. Construct the blocks of the dual of D, and verify that it is not balanced