Each of the following sets of propositions can serve as premises for a valid sorites. For each, find the conclusion and establish that the argument is valid.

(1) The only articles of food that my doctor allows me are such as are not very rich.
(2) Nothing that agrees with me is unsuitable for supper.
(3) Wedding cake is always very rich.
(4) My doctor allows me all articles of food that are suitable for supper.