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For mapping, there are Mapping Cardinality Constraints and some traditional

For mapping, there are Mapping Cardinality Constraints and some traditional mapping methods such as One to one, One to many, Many to one, and Many to many.

Please describe the  Mapping Cardinality Constraints, examples of 4 mappings, and provide possible (extra) mapping mechanism that is different from the above 4 mappings.

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