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