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What are the counting states $\left(Q_{1}, Q_{2}\right)$ for the counter shown in the figure below ?

1. $11,10,00,11,10, \ldots$
2. $01,10,11,00,01, \ldots$
3. $00,11,01,10,00, \ldots$
4. $01,10,00,01,10, \ldots$