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     1.2 +++ b/demo/grid_graph_demo.in	Mon Sep 12 11:24:54 2005 +0000
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     1.6 +..X....X.X
     1.7 +.XX.X.XX..
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     1.9 +XXXXXX.X..
    1.10 +.........X
    1.11 +.X.XXXXXXX
    1.12 +.X...XX...
    1.13 +.X.X....X.