Quotation על פסחים 6:23

Sukkah with many statements - ...and the methods of repairing each are different, so it was necessary to change the wording for each method of repair. For example, if it is too tall, lower it, or if it is not tall enough, raise it, or if it does not have three walls, build one, or if its sunlight is greater than its shade, add sekhakh. Thus it was concise and taught "invalid," since we are able to encompass everything with "invalid," as we hold (Pesakhim 3b), "A person shall teach his student in a concise way."