19735
RATIONALE : Intermittent delivery of an important commodity ( e . g . , food pellets ) generates excessive behaviors as an adjunct to the schedule of reinforcement ( adjunctive behaviors ) that are hypothesized to be due to conflict between engaging and escaping a situation where reinforcement is delivered , but at suboptimal rates .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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