B
A
R
A
A
R
R
B
B
S
R
S
T
B
S
R
R
S
A
T
R
T
B
B
T
S
R
T
R
B
B
S
A
B
A
T
S
T
T
T
S
A
A
S
A
S
T
A
R
S
B
A
T
B
B
S
A
S
A
T
B
R
B
S
R
T
R
T
B
T
R
S
A
R
A