as the faq says if we wants to unlike and the rest we need some points known as karama. how can we increase our karama in our account???
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@bibinpreethy >> From what I have understood, your karma increases when people upvote your question/answer, when someone accepts your answer, etc.
For example, note my karma, and check after upvoting and accepting this answer, you will see an increase of 15+25 karma. (15 for upvoting, 25 for accepting). Just fun intended 
Will you be a more clear as to what do you want to ask?
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Do good karma(work), thereby you will gain karma.
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You can read all about the Karma system here: http://discuss.codechef.com/questions/13/how-does-the-karma-system-work. We hope this will help you understand Karma system in a better manner.
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“if we wants to unlike and the rest” statement not clear.
so why dont you upvote my question??
i have upvoted your answer…
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