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### 15 Cards in this Set

• Front
• Back
 There exists Backwards 'E' For all Upside down 'A' Therefore 3 dots Such that Backwards epsilon Contained in Epsilon The set of all real numbers Double sided 'R' If and only if (2) iff Double lined arrow in both directions Implies Double lined arrow to the right Defined to be 3 lines Change Delta/Triangle Done with proof (3) Shaded square Railroad tracks QED Suppose 'S' with an added vertical line The set of all natural numbers Double sided 'N' or n <- double sided 'N' Union 'U' Intersection Upside down 'U'