简单的马尔科夫算法，Markov链数据提供了有当前状态决定，而又独立于当前状态的序列，此处算法是将给定的文本串生成新的随机文本- Simple Sample of a Markov Chain Algorithm：A markov chain is a sequence of random variables in which the future variable is determined by the present variable but is independent of the w