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A graph $G$ is interval colorable if $G$ has an interval $t$-coloring for some positive integer $t$. Let $\\mathfrak{N}$ be the set of all interval colorable graphs. For a graph $G\\in \\mathfrak{N}$, the least and the greatest values of $t$ for which $G$ has an interval $t$-coloring are denoted by $w(G)$ and $W(G)$, respectively. 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