4.
给定集合\(S=\{x_{1},x_{2},…,x_{n}\}(n\geqslant 2\),\(x_{k}∈R\)且\(x_{k}\neq 0\),\(1\leqslant k\leqslant n)\),\((\)且\()\),定义点集\(T=\{(x_{i},x_{j})|x_{i}∈S\),\(x_{j}∈S\}.\)若对任意点\(A_{1}∈T\),存在点\(A_{2}∈T\),使得\( \overrightarrow{OA_{1}}\cdot \overrightarrow{OA_{2}}=0(O\)为坐标原点\()\),则称集合\(S\)具有性质\(P.\)给出以下四个结论:
\(①\{-5,5\}\)具有性质\(P\);
\(②\{-2,1,2,4\}\)具有性质\(P\);
\(③\)若集合\(S\)具有性质\(P\),则\(S\)中一定存在两数\(x_{i}\),\(x_{j}\),使得\(x_{i}+x_{j}=0\);
\(④\)若集合\(S\)具有性质\(P\),\(x_{i}\)是\(S\)中任一数,则在\(S\)中一定存在\(x_{j}\),使得\(x_{i}+x_{j}=0\).
其中正确的结论有 ______ \(.(\)填上你认为所有正确的结论的序号\()\)