Groups may be homogeneous or heterogeneous. A homogeneous group contains one repeating element (for example, a list of names). A heterogeneous group contains repeating sets of elements, for example, a list of names and phone numbers where a set of elements is a name and the person’s phone number.
Data in a homogeneous group looks like this:
John Smith|Jane Jones|Tom White|###
Data in a heterogeneous group looks like this:
John Smith^680-7800|Jane Jones^680-7092|Tom White^685-8564|###
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