§ 3011. Kinds of pleadings. There shall be a complaint and an answer.
An answer may include a counterclaim against a plaintiff and a
cross-claim against a defendant. A defendant's pleading against another
claimant is an interpleader complaint, or against any other person not
already a party is a third-party complaint. There shall be a reply to a
counterclaim denominated as such, an answer to an interpleader complaint
or third-party complaint, and an answer to a cross-claim that contains a
demand for an answer. If no demand is made, the cross-claim shall be
deemed denied or avoided. There shall be no other pleading unless the
court orders otherwise.