Answer:
Start to end
1) N
2)P
3)J
4)B
5)A
6)i
7)L
8)E
9)G - 14b
10)H
11)O
12)M
13)C
14)D
15)K
16)F
Hope this helps, I've matched it up with the letters starting at the top box first, then going down.
