1D 2B 3D 4D 5A 6A 7B 8C 9B 10B 11A 12B 13A 14C15D 16D 17C 18D 19C 20D135

Exercise 10:1D 2B 3D 4D 5A 6A 7B 8C 9B 10B 11A 12B 13A 14C15D 16D 17C 18D 19C 20D135