        Output the "previous" branch(es) in the patch series containing the
        current or named branch.  The "previous" branch(es) being one step
        away by default.

        Options:
          -i            show dependencies based on index instead of branch
          -w            show dependencies based on working tree instead of branch
          -n <steps>    take `<steps>` "previous" steps (default 1)
          --all         take as many "previous" steps as possible (aka `-a`)
          --verbose     show containing series name(s) (aka `-v`)

        The `-n` option may also be given as `--count` or `--count=<n>`.

        To list all dependencies of a branch see the `--deps` option of
        the "tg info" command.

        See also "NAVIGATION" for full details on "previous" steps.

