The occurrence of at least two of the same lexemes in one sequence (A<B) and in the reverse sequence (B<A).
[B]ehavior built language in the brain; the brain did not build language in behavior. (Kennedy and Terrace 2016)
[B]ehavior
built language in
b
language
the brain
build language in
behavior
Studdert-Kennedy, Michael, and Herbert Terrace. 2016. “The Birth of Language.” The New York Review of Books, September 29, 2016.