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Incorrect placing of the polyhedron sometimes left it on a blue
square. Oops.

[originally from svn r4175]

--- a/cube.c

+++ b/cube.c

@@ -559,7 +559,7 @@

     /*

      * Choose a non-blue square for the polyhedron.

      */

-    sprintf(p, ":%d", rand_upto(m));

+    sprintf(p, ":%d", data.gridptrs[0][rand_upto(m)]);

     sfree(data.gridptrs[0]);

     sfree(flags);