Pair number 3 is different.
Counting letter from A, then from Z, each pair has reversed numbers, i.e. for A we have a pair (1, 26) and for Z we have (26, 1). The only pair which does not follow this rule is S and F.
A
|
B
|
C
|
D
|
E
|
F
|
G
|
H
|
I
|
J
|
K
|
L
|
M
|
N
|
O
|
P
|
Q
|
R
|
S
|
T
|
U
|
V
|
W
|
X
|
Y
|
Z
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
26
|
25
|
24
|
23
|
22
|
21
|
20
|
19
|
18
|
17
|
16
|
15
|
14
|
13
|
12
|
11
|
10
|
9
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
1
|
Whoops, pair number 1 is also potential winner, it is the only one containing a vowel. I did not think through, when creating this puzzle, therefore it has two solutions.
Some might even see a third solution, since the pair, M and N are the only consecutive letters in the alphabet :0)
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