(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column
(E) none of the above
(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column
(E) none of the above
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