until -package:numeric-prelude -package:base-prelude -package:distribution-opensuse -package:extra -package:netwire -package:intro -package:free -package:basic-prelude -package:rebase -package:hedgehog package:dunai
Similar to Yampa's delayed switching. Loses a b in case of an
exception.
Run the first
msf until the second one produces
True
from the output of the first.