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Assit. Programmer | Sonali Bank, Rubali Bank, BD Krishi Bank - 16.11.2018 ||

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{(1,a),(1,b)(2,a)(b,b)}
{(1,1),(2,2),(a,a),(b,b)}
{(1,a),(2,a), (1,b), (2,b)}
{(1,1),(a,a),(2,a),(1,b)}