Revert "use-case etc."

This reverts commit ef4124648085535ca6a8234d3dfe699bd3139324.
Revert "Revert "use-case etc.""

This reverts commit f6fb1ee704f51a32a2703228cfba03d5e3ed8da5.
Revert "Revert "Revert "use-case etc."""

This reverts commit c7ea4072eaa58ff90291207b85f08eee622679bf.
Konrad