Aptitude question (related to markauto and unmarkauto)

["Joona Kiiski" <joona.kiiski@gmail.com>]

I've collected a list of packages (about 50-100 packages) which I want
to be installed in my debian system.

Is there a command by using which I could tell apptitude to unmarkauto
all those packages and at the same time markauto all the rest
installed packages.

"aptitude markauto ~i && aptitude markauto $list"
is something I'm looking for, but it has a "nice" side effect first
removing everything and then putting everything back. Is there a way
to combine those commands? (Tried to read man and docs, but didn't
find answer)

Joona Kiiski