+const int halfDensityMap[][9] =
+{
+ {2, 0, 1},
+ {2, 1, 0},
+
+ {4, 0, 0, 1, 1},
+ {4, 0, 1, 1, 0},
+ {4, 1, 1, 0, 0},
+ {4, 1, 0, 0, 1},
+
+ {6, 0, 0, 0, 1, 1, 1},
+ {6, 0, 0, 1, 1, 1, 0},
+ {6, 0, 1, 1, 1, 0, 0},
+ {6, 1, 1, 1, 0, 0, 0},
+ {6, 1, 1, 0, 0, 0, 1},
+ {6, 1, 0, 0, 0, 1, 1},
+
+ {8, 0, 0, 0, 0, 1, 1, 1, 1},
+ {8, 0, 0, 0, 1, 1, 1, 1, 0},
+ {8, 0, 0, 1, 1, 1, 1, 0 ,0},
+ {8, 0, 1, 1, 1, 1, 0, 0 ,0},
+ {8, 1, 1, 1, 1, 0, 0, 0 ,0},
+ {8, 1, 1, 1, 0, 0, 0, 0 ,1},
+ {8, 1, 1, 0, 0, 0, 0, 1 ,1},
+ {8, 1, 0, 0, 0, 0, 1, 1 ,1},
+};
+