@item backup
Move back to the previous place that a question was asked about.
+@item undo
+Undo last replacement and move back to the place where that
+replacement was performed.
+
+@item undo-all
+Undo all replacements and move back to the place where the first
+replacement was performed.
+
@item edit
Enter a recursive edit to deal with this question---instead of any
other action that would normally be taken.