CREDITS:

Code and some graphics by Mark Robson, mark@vectrex.org.uk

(c) 2012, do not use without permission.

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"seedrandom.js" (c) 2011 David Bau, used within terms of license.
See file "seedrandom.js" for more details.

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Some graphics derived from Reiner's Tileset. 
http://www.reinerstilesets.de/2d-grafiken/2d-humans/

(c) Reiner Prokein. Used within terms of license.