Circular references

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Explanation 1:
A circular reference is a series of references where the last object references the first, resulting in a closed loop. Br />
Explanation 2:
A circular relationship exists when every occurrence of entity A has one or more occurrences of entity B; entity B has one or more occurrences of entity C; and entity C has one or more occurrences of entity A

A => B => C => A

You can prevent circular references by using a link table:

A => ABC
B => ABC
C => ABC