Revert "Merge branch 'branch-a'"

This reverts commit 65212610a8c5791c919c7dc3a9c6c1637b9d8322, reversing
changes made to 9ac1c2f4f836b221cc29e6a64e2dc144b171e2a9.

deleted:    branch-a.txt
	deleted:    branch-a1.txt