finding the merge of two or more commits

Hi,

Given two commits c1 and c2, is it possible to ask git if there are
any commits in the repository that were created by either a sequence
of commands like:

git checkout c1
git merge c2

or:

git checkout c2
git merge c1

with any required conflict resolution?

That is, I don't want to merge c1 and c2 myself, but I want to know if
someone else has merged c1 and c2, performed any conflict resolution
and committed the result.

Thanks,
ER