Based on cutting a tree the is felled down in the forest in two, the student has to cut a disk from two logs. The logs are fixed under different angles and the disks must be cut first halfway up and secondly halfway down. The disks must be between 3 and 8 centimeter of thickness and the angles at the logs must be 90 degrees. Combined with the time the angles and the height difference between the two cuts give the points.
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