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Any word $\\omega\\in W$ with $m$ $x$'s and $n$ $D$'s can be expressed in the normally ordered form $\\omega=x^{m-n}\\sum_{k\\ge 0} {{\\omega}\\brace {k}} x^{k}D^{k}$, where ${{\\omega}\\brace {k}}$ is known as the Stirling number of the second kind for the word $\\omega$. 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