     enum Index : Int { case INTERIOR = 0, BOUNDARY, EXTERIOR }
     
     private
-    var matrix: [[Dimension]] =
-        [
-            [.EMPTY, .EMPTY, .EMPTY],
-            [.EMPTY, .EMPTY, .EMPTY],
-            [.EMPTY, .EMPTY, .EMPTY]
-        ]
+    var matrix: [[Dimension]]
 }
 
 /**

extension IntersectionMatrix  {
    
    /**
     Initialize an IntersectionMatrix an Array of Arrays of
     of Dimension values.
     
     - Prameter: arrayLiteral: [[Dimension]] Array of `Dimension` arrays.

                        continue
                    case "F":
                        
                        if Dimension.EMPTY != self.matrix[row][col] {
                            return false
                        }
                        continue
                    case "*":
                        // All are valid
                        continue
                    case "0":
                        
