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Submit only the files mentioned in the header of the homework and in the correct column indicated as Exercise Sheet.
For each homework, you have to submit files in two different columns. For instance: column 1 is for exercise 1 of Homework 1, column 2 is for exercise 2 of Homework 1, column 3 is for exercise 1 of Homework 2, column 4 is for exercise 2 of Homework 2, etc.
Wiki-page on submission process: