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   2. http://www.vocabulary.com
   3. http://nbviewer.jupyter.org/github/librosa/librosa/blob/ master/examples/libROSA%20demo.ipynb.
   4. Emotion Detection Analysis Through Tone Of User: A Durvey- Ankita Dutta Chowdhuri , Sachin Bojewar.
   5. http://www.neuralnetwork.com