Write the argument using propositional wffs (use the statement letters shown). Then, using propositional logic, including the rules in Table 1.14 (Mathematical Structures for Computer Science 7th Edition), prove that the argument is valid:

52). If the birds are flying south and the leaves are turning, then it must be fall. Fall brings cold weather. The leaves are turning but the weather is not cold. Therefore, the birds are not flying south. B, L, F, C.