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有关国家机关依法在自然保护区履行法定职责的，自然保护区管理机构应当提供必要便利。
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Силовые структуры
Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.
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