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2.4. Build the group

After creating modules and edges they must be arranged in a level based structur. This is done using the FixIt() function at the end of the group constructor. The modules and edges build a tree. This tree must not contain cycles within down or up edges. If this happens, the FixIt() function is not able to set all modules on specific levels. These modules and the connected edges are then left out. corrsponding messages on output are create in order to inform the programmer.

If all modules and edges have been defined correctly, the group will work correct and can be checked using the MCAadmin tool.