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1. 高端点的用R wordcloud package
https://cran.r-project.org/web/packages/wordcloud/index.html
http://www.r-bloggers.com/tagcloud-creating-tag-word-clouds/
2. 省事点的用网页工具:
http://www.edudemic.com/9-word-cloud-generators-that-arent-wordle/
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