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Level 3
R - Respiratory systemR01 - Nasal preparationsR01A - Decongestants and other nasal preparations for topical use
R01AA - Sympathomimetics, plainR01AB - Sympathomimetics, combinations excluding corticosteroidsR01AC - Antiallergic agents, excluding corticosteroidsR01AD - CorticosteroidsR01AX - Other nasal preparations
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