What are the consequences of an AD group that has as its member a group, that is already a member (Cyclic references)

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http://serverfault.com – I have been looking at an Active Directory that has several thousand groups, where pairs of groups are members of each other. GroupA has GroupB as a Member. GroupB has GroupA as a Member. Oy. I am trying to think through possible consequences of this circular nesting of groups. (HowTos)