1B 2A 3B 4D 5C 6A 7B 8A 9C 10B 11C 12D 13D 14C15A 16C 17D 18C 19B 20A

Exercise 9:1B 2A 3B 4D 5C 6A 7B 8A 9C 10B 11C 12D 13D 14C15A 16C 17D 18C 19B 20A