Thu, 25 May 2017 21:53:44 +0900 Yuya Nishihara cat: add formatter support
Sat, 27 May 2017 17:58:36 +0900 Yuya Nishihara cat: use with statement to close output file
Thu, 25 May 2017 21:43:09 +0900 Yuya Nishihara cat: stop using makefileobj()
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