Ответ:

16, b

17, a

18, c

19, a

20 честно говоря, хз, прошу прощения

21, c

22, c

23, b

24, a

25, a

26, b

27, c

28, c

29, b

30, a

Ответ:

16 b

17 a

18 c

19 a

20 a

21 c

22 c

23 b

24 a

25 a

26 b

27 c

28 c

29 c

30 a