Finding a Pattern

Question

1 25 28 31 54 2 2 K
21 31 50 51 69 8 3 J
13 18 37 54 61 5 2 I

19 20 21 42 48 23 3 H 
2 3 16 48 56 24 2 G

1 28 33 55 56 22 2 F

10 16 38 43 63 23 2 E
16 30 34 37 44 16 2 D
3 54 61 64 68 9 2 C
8 18 27 29 60 15 2 B
2 12 50 61 64 1 2 A

 

FIND A PATTERN BETWEEN THESE NUMBERS AND PREDICT PATTERN L

Answer 1

To me the obvious one is that they end with a letter of the alphabet and in reverse order.

Certainly a non-obvious one is not obvious to me.