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It is well-known that each pseudo-Boolean function $f$ can be written as $f(x)=\\sum_{I\\in {\\cal F}}\\hat{f}(I)\\chi_I(x),$ where ${\\cal F}\\subseteq \\{I:\\ I\\subseteq [n]\\}$, $[n]=\\{1,2,...,n\\}$, and $\\chi_I(x)=\\prod_{i\\in I}x_i$ and $\\hat{f}(I)$ are non-zero reals. The degree of $f$ is $\\max \\{|I|:\\ I\\in {\\cal F}\\}$ and the width of $f$ is the minimum integer $\\rho$ such that every $i\\in [n]$ appears in at most $\\rho$ sets in $\\cal F$. 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