Nothing wrong with this point.
However, we still don't know the answer to my initial question.
Wonder what subcommands can be used there.
In Minitab 17, even attempting to use a subcommand -- i.e., using a semicolon at the end of Stop -- gave an error message.
Minitab 18 permits the semicolon, and waits there for you, asking what subcommand you want to use.