Collaborative Research Center SFB 876, TU Dortmund University, Dortmund, Germany. Sven.Rahmann@uni-due.de.|Department of Computer Science and Engineering, Aliah University, Kolkata-700091, West Bengal, India. sumantababai86@gmail.com.|Department of Computer Science and Engineering, Aliah University, Kolkata-700091, West Bengal, India. sumantababai86@gmail.com.