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L1 · First-line Ladder (1)
Beginner
Step 1 / 2
A
A
9
9
B
B
8
8
C
C
7
7
D
D
6
6
E
E
5
5
F
F
4
4
G
G
3
3
H
H
2
2
J
J
1
1
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