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Two sequences $x_{1}[n]$ and $x_{2}[n]$ have the same energy. Suppose $x_{1}[n]=\alpha\: 0.5 ^{n}\:u[n],$ where $\alpha$ is a positive real number and $u[n]$is the unit step sequence. Assume  ÝŠ$$x_{2}[n]= \begin{cases} \sqrt{1.5}& \text{for } n = 0,1 \\  0 &\text{otherwise.} \end{cases}$$ Then the value of $\alpha$ is _________.
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