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X belongs to {a,b}* such that n(a)<n(b)<2n(a) is a CFL.

Please somebody explain the push and pop sequences of the alphabets on the stack. I'm not being able to visualise, how it is CFL?

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Is the following language context free:The set of all strings with number of a’s equal to number of b’s and the sum of a’s and b’s to be divisible by 3.