Long description

Part (a): A horizontal rectangular block has four partitions labeled A, B, C, and D from left to right. All four partitions are marked with values 8, 4, 4, and 4 from left to right. Part (b): A horizontal rectangular block has four partitions labeled B, C, D, and A from left to right. All four partitions are marked with values 4, 4, 4, and 8 from left to right.