In the following reaction,identify X. 
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Definitions:
Past Tense of Verbs
The form of verbs used to describe actions that have already happened.
Chomsky
Refers to Noam Chomsky, a prominent linguist, philosopher, and cognitive scientist known for his significant contributions to the development of generative grammar and criticism of behaviorism.
Language Acquisition Device (LAD)
A hypothetical module in the human brain posited by Noam Chomsky to underlie the innate ability to acquire language.
Noam Chomsky
An influential linguist and political activist, known for his theories on generative grammar and for critiquing media and foreign policy.
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