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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def iter_cloneable_placeholders(self):
 """ Generate a reference to each layout placeholder on this slide layout that should be cloned to a slide when the layout is applied to that slide. """

        latent_ph_types = (
            PP_PLACEHOLDER.DATE, PP_PLACEHOLDER.FOOTER,
            PP_PLACEHOLDER.SLIDE_NUMBER
        )
        for ph in self.placeholders:
            if ph.element.ph_type not in latent_ph_types:
                yield ph