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Then we take $q_{11},..., q_{nn}\\in ]0,+\\infty[$ and $p \\in Q\\equiv \\prod_{j=1}^{n}]0,q_{jj}[$. If $\\epsilon$ is a small positive number, then we define the periodically perforated domain $\\mathbb{S}[\\Omega_\\epsilon]^{-} \\equiv \\mathbb{R}^n\\setminus \\cup_{z \\in \\mathbb{Z}^n}\\mathrm{cl}\\bigl(p+\\epsilon \\Omega +\\sum_{j=1}^n (q_{jj}z_j)e_j\\bigr)$, where $\\{e_1,...,e_n\\}$ is the canonical basis of $\\mathbb{R}^n$. 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