The document describes the rules for permuting nodes in a 3D cube. Each of the 8 nodes (000, 001, 010, etc.) is connected to 3 other nodes by changing one digit (bit) in its 3-digit binary representation. For example, node 000 connects to 001, 010, and 100. The full permutation connects all 8 nodes in a pattern representing the connections between values in a 3D cube structure.