  == REASON  for edit of 4 caste  ==  http://www.kamat.com/indica/caste/  u can check in that website, there is no such thing as a 4 caste system. it is just nonsense interpretation by europeans. you can literally count 1000s of castes and subcastes in india. the above website also dispels some myths of the caste system. it would do you well to go through it.