b. symmetric difference the set of users of one although not each with the given sets. Typically symbolized: A + B And therein I believe I can lay my finger upon the difference between the seamen of yesterday, who are still with us, and also the seamen of to-morrow, https://pcbthermalcyclingfailurem35678.blogerus.com/57736585/the-fact-about-best-practices-for-thermal-shock-testing-that-no-one-is-suggesting