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Love you guys.  After these couple of words worthy (or not) of your attention before the story even begins... 3,5 year that this thesis was in the making. Here're four chapters. Nearly everything I intended is in it, and still the thesis is not full. I cried, I hurt, I tried, I failed, and I failed again, and I learnt. Good and bad ideas are in it along with only a little bit of despondency and enormous pleasure of discovering. Here're four chapters through which I tried to briefly and gracefully communicate four things. Each chapter tells one story. All the stories create an image which I could definitely keep on painting further. But let's close it for now, let's draw the curtains now  and put let  the light on. Here my story begins... curtain go up.