简易汉字提取和重复汉字剔除器，将输入的所有文本字符先提取汉字，再剔除重复的汉字，可以用来统计一篇文章使用了多少个不重复的汉字~-Simplified Chinese characters drawing and remove duplication of device, the input characters in the first extract all the text characters, and then remove the duplicate characters, can b