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