TRIANGULATED
ARTIFICIAL
SUSPENDED
GRAVITY
NATURAL
SHELL
FRAME
RARES
I
D
S
X
R
Y
Y
A
I
A
M
O
C
X
B
K
O
U
C
A
R
X
Y
Z
Z
I
J
D
I
Q
O
B
S
O
R
T
T
V
I
V
D
E
I
V
E
J
M
P
I
E
T
B
G
G
A
T
Z
D
I
H
U
V
E
F
S
H
E
L
L
A
P
P
I
O
A
V
U
N
V
A
W
T
X
L
J
K
H
R
W
A
E
U
D
E
E
L
K
U
P
W
G
A
X
R
A
G
E
E
U
A
H
G
A
R
T
I
F
I
C
I
A
L
D
R
N
N
M
E
I
X
I
Y
Z
B
G
L
E
U
R
A
N
E
I
A
O
K
O
A
J
M
O
T
N
I
R
Y
D
S
Q
A
L
E
A
A
O
A
K
R
Z
U
I
O
S
I
E
R
Q
Q
U
N
P
T
G
K
P
Y
I
C
F
M
X
W
E
B
L
P
