已知集合\({{A}_{n}}=\{({{x}_{1}},{{x}_{2}},\cdots \cdots ,{{x}_{n}})|{{x}_{i}}\in \{-1,1\}(i=1,2,\cdots ,n){ }\!\!\}\!\!{ }\).\(x,y\in {{A}_{n}}\),\(x=({{x}_{1}},{{x}_{2}},\cdots ,{{x}_{n}})\),\(y=({{y}_{1}},{{y}_{2}},\cdots ,{{y}_{n}})\),其中\({{x}_{i}},{{y}_{i}}\in \{-1,1\}(i=1,2,\cdots ,n)\).
定义\(x\odot y={{x}_{1}}{{y}_{1}}+{{x}_{2}}{{y}_{2}}+\cdots +{{x}_{n}}{{y}_{n}}.\)若\(x\odot y=0\),则称\(x\)与\(y\)正交.
\((\)Ⅰ\()\)若\(x=(1,1,1,1)\),写出\({{A}_{4}}\)中与\(x\)正交的所有元素;
\((\)Ⅱ\()\)令\(B=\{x\odot y|x,y\in {{A}_{n}}\}.\)若\(m\in B\),证明:\(m+n\)为偶数;
\((\)Ⅲ\()\)若\(A\subseteq {{A}_{n}}\),且\(A\)中任意两个元素均正交,分别求出\(n=8,14\)时,\(A\)中最多可以有多少个元素.