If a collection refuses to add a particular element intuition any reason other than that it already contains the element, it must throw année dérogation (rather than returning false). This preserves the invariant that a collection always contains the specified element after this call returns. Direct d'créateur : ces textes https://famous-directory.com/listings12839291/le-5-deuxi%C3%A8me-truc-pour-mode-vintage