In thousands upon thousands of comics, there are tons of different conversations and adventures between duos, trios, and larger groups of classic DC heroes. But given that there are so many, the possible combinations outnumber the real examples.
So, which big-name characters do you have no recollection of having a meaningful conversation with each other?
Which characters have a frequent friend in common but never pair up directly or feature as a trio?
What kinds of atypical groupings would you like to see in a story?
Feel free to use process of elimination if you have an example for another poster.