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\end{equation}  suppose that $a=sr$ and $a^+=s^+r^+$, $a^+=r^+s^+$,  then one could define \begin{equation} r|n>=\sqrt[4]{n}|n-\frac{1}{2}> \\  s|n>=\sqrt[4]{n+\frac{1}{2}}|n-\frac{1}{2}> \\