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For $X\\subseteq V$, the subtournament of $T$ induced by $X$ is $T[X] = (X, A \\cap (X \\times X))$. An interval of $T$ is a subset $X$ of $V$ such that for $a, b\\in X$ and $ x\\in V\\setminus X$, $(a,x)\\in A$ if and only if $(b,x)\\in A$. The trivial intervals of $T$ are $\\emptyset$, $\\{x\\}(x\\in V)$ and $V$. A tournament is indecomposable if all its intervals are trivial. For $n\\geq 2$, $W_{2n+1}$ denotes the unique indecomposable tournament defined on $\\{0,\\dots,2n\\}$ such that $W_{2n+1}[\\{0,\\dots,2n-1\\}]$ is the usual total order. 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