Reversing Key using pattern

I have attached a file containing almost a 1000 legitimate pass codes to try reverse.

1) License position 1:
If the serial# starts with 5xxxx, the license char 1 = d
If the serial# starts with 6xxxx, the license char 1 = P

2) License position 2:
Partially determined by 2nd char in serial#
a) x0xxx = B or 7
b) x1xxx = N or R
c) x2xxx = F or J
d) x3xxx = V or Z
e) x4xxx = B or 7
f) x5xxx = N or R
g) x6xxx = F or J
h) x7xxx = V or Z
i) x8xxx = B or 7
j) x9xxx = T or P

Still not sure what determines which

3) License position 8:
Similar to position 2 except characters differ.
a) x0xxx = H or 9
b) x1xxx = l or d
c) x2xxx = X or P
d) x3xxx = t or 1
e) x4xxx = H or 9
f) x5xxx = l or d
g) x6xxx = X or P
h) x7xxx = t or 1
i) x8xxx = H or 9
j) x9xxx = p or h

4) License Position 11:
Based solely on the last digit of the serial#
0 = N
1 = R
2 = P
3 = T
4 = M
5 = Q
6 = O
7 = S
8 = N
9 = R

5) License position 12 (last char):
Is based on if the serial starts with 5xxxx or 6xxxx.
If serial starts with 5xxxx, then it's one of 4 chars:
a) z
b) v
c) N
d) r

If serial starts with 6xxxx, then it's one of 4 chars:
a) 0
b) s
c) W
d) O

Still not sure what determines it.

Any help would be appreciated.