Returns a set of units previously created using createUnitSet If a name is given, a search is carried out to find a set of units with that name. If an integer is given, it is assumed to be the index of a set of units. The index represents the order in which createUnitSet was originally called, so the first set of units created has the index 0 and so on.
| Arguments | none | |
| Return value | array of UnitSet objects | the returned array |
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