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Thank you for creating a pull request!

Please double-check the following.

- Read [our contribution guide](http://docs.chainer.org/en/stable/contribution.html).
  - Does you code conform to our coding guidelines?
  - Did you write sufficient test code?
  - Did you write sufficient documentation?
- Also take a look at [our compatibility policy](http://docs.chainer.org/en/stable/compatibility.html).

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