This is because we depend entirely upon the form of the statements and not upon what we are talking about. All whales are subject to colds. The diagram shows that W is a subset of M as required by statement 1, that M is a subset of B as required by statement 2, and that B is a subset of C as required by statement 3. The only conclusion that uses all of our given statements is that W is a subset of C, as asserted by statement 4. If you have read Alice's Adventures in Wonderland or Through the Looking-Glass , you know that author Lewis Carroll delights in giving sets of nonsense statements which lead to logical conclusions.
Nobody is despised who can manage a crocodile.
Babies cannot manage crocodiles. Other sets of statements written by this author follow. To draw a conclusion from each set of statements, first arrange the statements in logical order. A diagram such as those in the preceding column may help you. The correct conclusions are given at the bottom of the page, but do not look at them until you have written your conclusion.