Components of classical conditioning

A common laboratory procedure for classical conditioning involves directing a puff of air into the eye of an immobilized rabbit. The automatic response to this stimulus is an eyeblink. In the conditioning procedure, a tone is sounded just prior to delivering the puff of air. Identify the CS, CR, UCS and UCR in this situation. Suppose you wanted to undo the conditioning; use the same terminology to describe how you might go about trying to do this.