Determine the missing starting material that would exclusively yield the product shown below. 
Definitions:
Psychological Transitions
Changes in psychological status or condition that occur as part of development, often relating to life events or phases.
Normative Changes
Changes that occur in a predictable pattern or sequence with age, often considered typical or standard within a population.
Existing Schema
A cognitive framework or concept that helps organize and interpret information.
Identity Assimilation
A psychological process where individuals integrate their new experiences into their existing self-concept, often modifying it to maintain a consistent identity.
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