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Rolling a Die over a Labeled Board
Label the faces of a unit cube with numbers -- as in a die. Place the cube to sit on an integer lattice grid, with one corner at the origin and sides aligned with the axes. Completely label every lattice square of a rectangular \textquotedblleft{}board\textquotedblright{} , whose corner is at the origin, with numbers in . The problem is to roll the cube over its edges so that, for each square labeled , the cube lands on precisely once, and when it does so, the top face of the cube has label .
What is the computational complexity of solving an instance of this problem?
