Sketch the level curves 
of the function for the indicated values of k. 
Definitions:
Self-Expansion
The desire to expand the self by including traits, qualities, and skills of another.
Partner's Identity
A concept referring to the aspects of an individual's self-concept derived from their relationship and perception by their partner.
Motivation
A psychological factor that drives an individual to take action toward achieving a desired goal.
Relationships
Refer to the connections, associations, or interactions between two or more individuals, which can be based on kinship, love, friendship, or other social commitments.
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