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In a recursive relationship type.
Both participations are same
entity type in different roles.
For example, SUPERVISION
relationships between EMPLOYEE (in role of
supervisor or boss) and (another)
EMPLOYEE (in role of subordinate or worker).
In following figure, first role
participation labeled with 1 and second role
participation labeled with 2.
In ER diagram, need to display role names to
distinguish participations.
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