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- exercises created by Group 1  (RO) 

- exercises created by Group 2 (RO)

- exercises created by Group 3 (RO)

- exercises created by Group 4 (RO)

- exercises created by Group 5 (RO)

- exercises created by Group 6 (RO)

- exercises created by Group 7 (RO)

exercises from Germany (here)

 exercises from UK (here)

exercises from Crete: (here)