How many benzylic hydrogens are present in the following molecule? 
Definitions:
Latent Learning
Learning that occurs without any obvious reinforcement or immediate demonstration of the learned behavior.
Obvious Reinforcement
Refers to a reinforcement that is clearly and directly related to a specific behavior, making the consequences of the behavior apparent.
Operant Conditioning
A learning process through which the strength of a behavior is modified by reinforcement or punishment.
Extinction
The gradual weakening and disappearance of a conditioned response tendency because the response is no longer reinforced.
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