The tasks are shown in pictures below.
Task stack_ABC -- the Sussman Anomaly:
                                           +---+
                                           | A |
     +---+                                 +---+
     | C |              --------->         | B |     
     +---+  +---+                          +---+
     | A |  | B |                          | C |
-----+---+--+---+-----                -----+---+-----
        TABLE


Task stack_ABC_2:
                                           +---+
                                           | A |
     +---+                                 +---+
     | A |              --------->         | B |     
     +---+  +---+                          +---+
     | B |  | C |                          | C |
-----+---+--+---+-----                -----+---+-----
        TABLE


Task stack_CBA:
                                           +---+
                                           | C |
     +---+                                 +---+
     | C |              --------->         | B |     
     +---+  +---+                          +---+
     | A |  | B |                          | A |
-----+---+--+---+-----                -----+---+-----
        TABLE

Task stack_BAC:
                                           +---+
                                           | B |
     +---+                                 +---+
     | C |              --------->         | A |     
     +---+  +---+                          +---+
     | A |  | B |                          | C |
-----+---+--+---+-----                -----+---+-----
        TABLE