A
B
B A A
A C D E F G H I J
K
L
M
N L
L M
M N
O P P
P I I
I Q Q
Q G G
G R R
S J J
R S S
J T T
T H H
H U U
U F F
F O O
O R
O K
K S F
K O
M
L
K
B
C D E F G H I J
F F
A