Make darcs force-commute patches from CLI, to learn about darcs?

Hi darcs-users,

I'm trying to learn more about how darcs force commutes work.

What I'd like to do is create a repository R1 with patches A and B,
and then look at the patches that result if A and B get
force-commuted.

E.g. if I could pull just patch B and not A to a new repository, I
think that would do the trick, but of course darcs pull won't let me
do that because B depends on A.

Question 1: Is there a simple way to make darcs do this?

I can think of two complicated ways, which I might resort to:
(a) Play with the darcs source code.
(b) Set up contrived situations involving merges to force darcs to do
the force-commutes I'm looking for.

Question 2: Is there a way to make "darcs changes" show the patch
contents? For now, I've been manually examining files in
_darcs/patches. I vaguely remember there's an option to darcs changes
or a related command to show the patch contents, but I can't seem to
find it now.

Thanks,
  James