Conversation so far:
what kind of work did dj paul do during 2013?
DJ Paul focused on performing as a DJ.
what did he do besides being a DJ?
and created a DJ duo, called S.I.M.
(Sex is Mandatory).
where was his work heard?
CANNOTANSWER.
who did he collaborate with?
Paul and Lord Infamous.

Question: what was their collaboration?
Self-contained rewrite: what was DJ Paul and Lord Infamous' collaboration?