Commit 1.
Add a.rb.
Modify a.rb.
Modify a.rb (2).
Modify a.rb (4).
Revert "Modify a.rb (2)."

This reverts commit 568876c35990551b27e37b276c75a7b084b9935f.

Conflicts:
	a.rb
Comment a.rb.
Add new content to a.rb.
Revert "Comment a.rb."

This reverts commit 91fb86f78d25c08dcc1a56ecccd887081f499f20.

Conflicts:
	a.rb