Помогите,затрудняюсь с выполнением

1 when 2 and 3 because 4 and 5 until 6 but 7 when 8 and 9 because 10 so 11 but 12 and 13 and 14 so
2 until f
3 when h
4 until a
5 when c
6 because d
7 until e
8 when b