(2) Where D is less than
no reduction shall be made except in a ship with an enclosed
superstructure covering at least 0.6 L amidships, with a complete
trunk, or combination of detached enclosed superstructures and trunks
which extend all fore and aft, where the freeboard shall be reduced
at the rate prescribed in paragraph (1) of this Regulation.
(3) Where the height of superstructure or trunk
is less than the standard height, the reduction shall be in the ratio
of the actual to the standard height as defined in Regulation 33.