master 1
volatile 1
volatile 2
volatile 3
master 2: Squashed commit of the following:

commit 51e5ced6e05ae3d414335e47df798f39c62536dc
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 18:07:07 2014 +0900

    volatile 3

commit 2d62769860c8309e927f8f9125793f8b3f9e658d
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 18:07:06 2014 +0900

    volatile 2

commit f4fb81c2dcba24a3a8521f430632734cee70b40b
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 18:07:05 2014 +0900

    volatile 1
master 3: Merge branch 'tmp.2014-01-06'