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A
drunkard's walk is a path constructed according to the following rules:
 There is a starting point.
 The distance from any point in the path to the next point in the path is a constant.
 The direction from any point in the path to the next point in the path is chosen at random.
The straightline distance between start and finish points of a drunkard's walk of length n is O(n^{1/2}).
Drunkard's Walk is a 1960
science fiction novel by
Frederik Pohl
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Activity
series
of
metals 
... ease of oxidation, or increasing ease of reduction. A metal can replace metals listed below it in the activity series, but not above. For example, sodium is highly active ... 

