على مدى حياتها الجماعية، أو الزمن الذي يمكن افتراض هويتها خلاله، تشبه كل طبقة فندقًا أو حافلة دائماً ممتلئة، ولكنها تمتلئ كل مرة بأشخاص مختلفين.

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