PW – Under ‘Dungeon Size’, it refers to the “Theme” and “Area limit” columns, when the columns are labelled “Themes” and “Areas”.
It’s also not clear until part 3 of the Plumbing Procedure that “the number of common and unique areas should each equal the area limit”, and that sort of clarification would be nicer under the ‘Dungeon Size’ section. (‘Dungeon Size’ and ‘Dungeon Areas’ both have vague wording that could imply either [size = total areas] OR [size = number of unique and size = number of common]).