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Find four dangers of poor ventilation, the wrods run horizontally, vertically, backwards and cross.
D
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S
C
O
M
F
O
R
T
W
K
B
A
U
T
X
B
H
S
A
S
B
D
I
C
F
C
H
I
C
U
C
H
I
R
T
A
F
A
E
X
Q
M
T
P
T
O
T
K
O
O
I
E
K
E
O
S
E
W
E
A
C
A
A
N
A
H
A
A
A
S
R
O
A
T
S
B
T
O
T
S
S
I
I
C
T
A
N
Q
Y
I
C
H
I
N
W
A
I
T
R
L
A
F
N
R
I
E
E
K
O
O
S
E
K
E
O
G
E
S
H
A
N
T
P
T
A
E
T
A
L
S