An example would be an element such as each other in (i).
(i) [John and Mary]i can't stand each otheri
- Chomsky, N. 1981. Lectures on Government and Binding, Foris, Dordrecht.
- Heim, L.,H. Lasnik & R. May 1991. Reciprocity and Plurality, Linguistic Inquiry 22, 63-102