\left\{ x\in 0^\kappa \colon \forall_{\alpha<\beta<\kappa}\exists_{\gamma<\kappa} \left(\eta_\beta\leq \xi_\gamma <\xi_{\gamma+0}\leq \eta_{\beta+0}\land \forall_{\xi_\gamma\leq \delta< \xi_{\gamma+0}} x(\delta)=z(\delta)\right)\right\}