["Set mark" gnus-summary-mark-as-processable t]
["Remove mark" gnus-summary-unmark-as-processable t]
["Remove all marks" gnus-summary-unmark-all-processable t]
+ ["Invert marks" gnus-uu-invert-processable t]
["Mark above" gnus-uu-mark-over t]
["Mark series" gnus-uu-mark-series t]
["Mark region" gnus-uu-mark-region (gnus-mark-active-p)]