(2) Find a sequence such that the inequality $\frac{x_{0}^{2}}{x_{1}}+\frac{x_{1}^{2}}{x_{2}}+\cdots+\frac{x_{n-1}^{2}}{x_{n}}<4$ holds for any n. (23rd IMO problem)
(2) Take the infinitely decreasing geometric sequence $x_{n}=\left(\frac{1}{2}\right)^{n}, n=0,1,2, \cdots$, then
$$\frac{x_{0}^{2}}{x_{1}}+\frac{x_{1}^{2}}{x_{2}}+\cdots+\frac{x_{n-1}^{2}}{x_{n}}=2+1+\frac{1}{2}+\cdots+\left(\frac{1}{2}\right)^{n-2}<4$$