-int dirs[NPERM][NDIR] = {
- {0,1,2,3}, {3,0,1,2}, {0,2,3,1}, {0,3,2,1},
- {1,0,2,3}, {2,3,0,1}, {0,2,1,3}, {2,3,1,0},
- {1,0,3,2}, {1,2,0,3}, {3,1,2,0}, {2,0,3,1},
- {1,3,0,2}, {0,3,1,2}, {1,3,2,0}, {2,0,1,3},
- {0,1,3,2}, {3,1,0,2}, {2,1,0,3}, {1,2,3,0},
- {2,1,3,0}, {3,0,2,1}, {3,2,0,1}, {3,2,1,0}
- };
+#if 0
+static int dirs[NPERM][NDIR] = {
+ {0,1,2,3}, {3,0,1,2}, {0,2,3,1}, {0,3,2,1},
+ {1,0,2,3}, {2,3,0,1}, {0,2,1,3}, {2,3,1,0},
+ {1,0,3,2}, {1,2,0,3}, {3,1,2,0}, {2,0,3,1},
+ {1,3,0,2}, {0,3,1,2}, {1,3,2,0}, {2,0,1,3},
+ {0,1,3,2}, {3,1,0,2}, {2,1,0,3}, {1,2,3,0},
+ {2,1,3,0}, {3,0,2,1}, {3,2,0,1}, {3,2,1,0}
+};
+
+static int incr[NDIR][2] = {
+ {0, 1}, {1, 0}, {0, -1}, {-1, 0}
+};