On the $T$-ideal generated by the identity $f=x^{n}$

Let $V_{n+K}=V_{n+K}\left(x_{1},...,x_{n+K}\right)$ denote the vector space of all multilinear polynomials in $x_{1},...,x_{n+K}$ over $\mathbb{F},$ a field of characteristic zero. In this paper we investigate the structure of the $S_{n+K}$-module $W_{n,n+K}=\left(x^{n}\right)^{T}\cap V_{n+K}$, where $\left(x^{n}\right)^{T}\triangleleft\mathbb{F}\left\langle x_{1},x_{2},...\right\rangle$ is the $T$-ideal generated by the identity $f=x^{n}.$