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What comes next? I, M, Q, U, Y, …
D
C
Z
G
What comes next? A, E, I, M, Q, …
R
T
Y
U
What comes next? G, P, H, O, I, …
N
O
M
J
What comes next? K1, M3, O5, Q7, …
S9
Q9
S8
T9
What comes next? F1, G3, H5, I7, …
J9
I9
K9
J8