已知函数\(f(x)= \begin{cases} |\log _{2}x|,0 < x < 2 \\ \sin ( \dfrac {π}{4}x),2\leqslant x\leqslant 10\end{cases}\)，若存在实数\(x_{1}\)，\(x_{2}\)，\(x_{3}\)，\(x_{4}\)，满足\(x_{1} < x_{2} < x_{3} < x_{4}\)，且\(f(x_{1})=f(x_{2})=f(x_{3})=f(x_{4})\)，则\( \dfrac {(x_{3}-2)(x_{4}-2)}{x_{1}x_{2}}\)的取值范围是\((\)　　\()\)