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+---+---+    +---+---+
| 1 | 2 |    | 1 | 4 |
+---+---+    +---+---+
| 4 | 3 |    | 2 | 3 |
+---+---+    +---+---+

my @clockwise = ( [0,3],[3,0],[5,2],[4,3],[3,2],[2,3],[3,4],[2,5] );
my @anticlockwise = ( [2,5],[3,4],[2,3],[3,2],[4,3],[5,2],[3,0],[0,3] 
+);

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