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[2019/8/22] Book OS v0.5.2 is published.

[2019/8/12] Book OS v0.5.1 is published.

[2019/8/11] Book OS v0.5.0 is published.

[2019/5/13] Book OS v0.4 is published.

[2019/5/ 2] Book OS v0.39 is published.

[2019/4/ 6] Book OS v0.3 is published.

[2019/2/20] Book OS v0.2 is published.

[2019/1/ 7] Book OS v0.1 is published.