Revert "some code example..."

This reverts commit e098b4e4040edee2427227af067e64514c8dd4ac.
Revert "Revert "some code example...""

This reverts commit 54cfdbc47d5c4b1340a4d899a21f1adaeee2fe32.
Revert "Revert "Revert "some code example..."""

This reverts commit 1f3c7d4bd33922ebe6b0bf917bc30d56af365ef5.