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"An elementary verbal operant that is evoked by a verbal discriminative stimulus and that does not have point-to-point correspondence with that verbal stimulus" (Cooper, Heron & Heward, 2007, p. 698).

"An elementary verbal operant evoked by a nonverbal discriminative stimulus and followed by generalized conditioned reinforcement" (Cooper, Heron, & Heward, 2007, p. 705).