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I think they want us to get four inputs e.g.
1 # X
2 # Y
3 # Z
4 # N
This means we have a 3D cuboid with 0 and 1 on the X direction, 0, 1, 2 on the Y direction and 0, 1, 2, 3 on the Z direction. These are a total of 2 x 3 x 4 nodes. At each of theese nodes we have to check if the sum of the node indices is equal to N. If it is not equal to N we will add this list to the list of nodes. E.g. if we look at the note (0, 0, 0) the sum of all the indices is equal to 0 which is clearly not equal to N = 4. Hence we append this node to our list and get [[0, 0, 0]]. Then we procede until we have checked every possible combination.