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Unformatted text preview: bend the rightmost wall up, then the next to the rightmost wall down. In the next to leftmost, you can bend the left half of the bottom wall to the left and the right half to the right.] You need to tear the walls in both of the right two pictures. #11. In each case, you can lift the left half of the right loop out into the fourth dimension. Then you can move the left loop away toward the left. Finally, you can return the left half of the right loop back from the fourth dimension into the third dimension, and the loops will be unlinked....
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 Spring '08
 Irwin

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