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Level 3
C - Cardiovascular systemC03 - DiureticsC03B - Low-ceiling diuretics, excluding thiazides
C03BA - Sulfonamides, plainC03BB - Sulfonamides and potassium in combinationC03BC - Mercurial diureticsC03BD - Xanthine derivativesC03BK - Sulfonamides, combinations with other drugsC03BX - Other low-ceiling diuretics
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