Why water cannot be separated completely from ethyl alcohol by fractional distillation?

Why water cannot be separated completely from ethyl alcohol by fractional distillation?
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Ethyl alcohol and water (95.4% ethyl alcohol and 4.6% water) form constant boiling mixture (azeotrope) boiling at 351.1 K. Hence, further water cannot be separated completely from ethyl alcohol by fractional distillation.
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