Description
Until 2.1D, it was possible to have recursive class hierarchies. Thesecan lead to infinite loops in classification functions. This programselects all classes and checks each class as to whether it hassubordinate classes and whether these occur more than once lower downin the hierarchy.

Output
If the program finds recursiveness, the exploded hierarchy is displayedin list form. As each class is checked individually, you may find thatthe same hierarchy is listed more than once.