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Which of the following are context free?$$A = \left\{a^nb^n a^mb^m \mid m, n \geq 0\right\}$$$$B = \left\{a^mb^n a^mb^n \mid m, n \geq 0\right\}$$$$C = \left\{a^mb^n\mid m \neq 2n, m, n \geq 0\right\}$$
A and B only
A and C only
B and C only
C only
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