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I'm having trouble understanding/linking the code example to the diagram and definition for the Factory Pattern. abstract class Shape { ... } class Rectangle extends Shape { ... } class Triangle extends Shape { ... } abstract class ShapeFactory { static function Create($type, array $sizes) { switch ($type) { case 'rectangle': return new Rectangle($sizes[0], $sizes[1]); break; case 'triangle': return new Triangle($sizes[0], $sizes[1], $sizes[2]); break; } } } $obj = Shap