What is the missing reagent in the reaction below? 
Definitions:
Cognitive Development
The process by which individuals learn and develop mental processes throughout their lives, including thinking, remembering, and problem-solving skills.
Circular Reactions
Circular reactions are repetitive actions typical in infant development, which allow the infant to replicate a desirable outcome, contributing to learning and motor skills development.
Cognitive Development
The process by which an individual learns, acquires knowledge, and develops an ability to reason and solve problems.
Cognitive Advanced
Referring to higher levels of cognitive processes or abilities that go beyond basic functions to include complex intellectual tasks and problem-solving.
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