Droing bilong faundesen
Droing bilong seksen bilong 'duct'
Eria aninit long graun
20
m
2
(
20000000
mm
2
)
Eria bilong wanpela 'vent'
0.012
m
2
(
12272
mm
2
)
Olgeta eria bilong ol 'vent'
0.061
m
2
(
61359
mm
2
)
Hamas win
5
ol samting
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