A
K
R
!
!
B
R
A
A
B
!
A
K
K
!
K
K
!
R
K
!
R
K
B
R
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!
K
B
A
R
K
K
A
R
K
A
A
A
B
!
B
B
B
R
B
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B
A
!
!
!
A
B