• Hashing: hash functions are closely related to encryption.

• Graphics: background picture paints picture, but another picture erases it and restores background. This is especially good for animation and for cursors, which move across a background.

• Linked lists: both forward and backward pointers can be stored in the same space using next previous. Since we will be coming from either next or previous, we can with the link value to get the other one.

• Wireless networking: if message (a b) is broadcast, those who know a can get b, and those who know b can get a.

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