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PHP Designing Interfaces in PHP Abstract Classes Extending an Abstract Class

In "Extending Abstract Classes" php - why is Alena not using the "parent" keyword in "Pages" class to acces constructor?

I thought - if w ewant to access parents methods - we need a this, or parent keyword to access it. When Alena instantiates the "pages" object, she pases it the arguments. However the class pages doesnt call for its parent costructor to process these arguments? A bit puzzling.