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Reciprocal

SYNTAX: element such as each other in (i). 

(i) [John and Mary]i can't stand each otheri
Reciprocals behave as anaphors with respect to binding theory, and require a plural antecedent (*that gang hates each other).
LIT. Chomsky, N. (1981)
Heim, L.,H. Lasnik & R. May (1991)