(2) Where D is less than no reduction shall be made, except in a ship with an enclosed
superstructure covering at least 0.6L 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).
(3) Where the height of the superstructure or
trunk is less than the corresponding standard height, the calculated
reduction shall be corrected in the ratio of the height of the actual
superstructure or trunk to the applicable standard height, as defined
in regulation 33.