Level 1: exercise 1, exercise 2, exercise 3
Level 2: exercise 1, exercise 2, exercise 3, exercise 4, exercise 5, exercise 6, exercise 7
Level 1: exercise 1, exercise 2, exercise 3, exercise 4, exercise 5, exercise 6 (navodila), exercise 7, exercise 8
Level 2: exercise 1, exercise 2, exercise 3, exercise 4, exercise 5, exercise 6, exercise 7, exercise 8, exercise 9, exercise 10, exercise 11, exercise 12 (navodila)
test 1 (level 1), test 2 (level 2), test 3 (level 3),