LATER 18 D D D C 19 A B C A 20 A D C C 21 B B A C...

50. later

18 D D D C

19 A B C A

20 A D C C

21 B B A C

22 A D A A

23 A D D D

24 A A C C

25 B A C A

26 B B B D

27 D A D D

28 D D B B

29 C C D B

30 C C D D