Skills, Interests, Nationality and Belonging all are stated as the part of the person's social Identity.
The social identity of a person reveals who they are in terms of the groups they are a part of. Social identity groups are often described by some of an individual's physical, social, and mental traits. As stated all Skills, Interests, Nationality and Belonging define in individual's physical, social, and mental traits in materialistic way
For example skills and interest are defined by the mental traits, physical traits are defined by nationality and belongings and so on.
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