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/gist:1085752
Created Jul 15, 2011

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(defn worldmap-add
[worldmap x y]
(let [ykey (keyword (str y))
xkey (keyword (str x))]
;;add the new x coord
(if (nil? (ykey worldmap))
(let [worldmap (assoc worldmap ykey {})]
(assoc worldmap ykey (assoc (ykey worldmap) xkey {})))
(assoc worldmap ykey (assoc (ykey worldmap) xkey {})))))
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