2
2
2 a
a
A
A
A A A A A A A A A A A A A A A A A A A B
B
B B B B B B B B B B B B B B B B B C
C
C C C C C C C C C C C C D
D
D D D D D D D D E
E
E E E E E F
F
F F G
G
G G G G G G G G G G G G G G G H
H
H H H H H H H H H H I
I
I I I J
J
J K
K
K K K K K K K L
L
L L L L L L L L L L L M
M
M M M M M M M M M M M M M M N
N
N N N N N N N N N N N N N N N N O
O
O O P
P
P P P P P P P P P P P P P P P P P P P P P P R
R
R R R R S
S
S S S S S S S S S S S S S S S S S S S S S T
T
T T T T T T T T T T T U
U
U U U U U V
V
V V V W
W
Y
Y
Y Z
Z
Z Z Z