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Final answer:The code splits the string based on the semicolon separator, resulting in a list with 3 elements.Explanation:The split method in Python separates a string into a list using a specified separator. In this case, the separator is a semicolon in the string variable y. The resulting list after applying the split(';') method would contain 3 elements: 'stuff', 'thing', and 'junk'. Therefore, the output of len(z) would be 3....