The three veterans have made some innovative improvements to a basic Treadmill design, and are trying to patent these improvements in the hope of selling their newly created device. Of course, these veterans realize that anyone who uses their new product will be violating the early Continental Marine message and motto of the famous Gadsden flag which states, "Don't Tread on Me". Just as Forrest Gump was encouraged to "Run - Forrest - Run", we wish success to these three veterans with the words, "Ron - Terry - Ron".
Answer:- Mary is not a nurse. The way to solve this riddle, is to consider statements 4, 5, and 6 and create a chart of all possible true and false answers. Next, fill in the chart according to statements 1 through 3. You will discover that there is only one line where only one of statements one, two and three are true. Thus, it is determined that: Statement 4 and 5 are false and statement 6 is true.