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2 ways of naming a set:

1.) Roster method
          - elements are put inside the braces to represent a set
 Ex.   U= {1, 3, 5, 7, 9, 11}

2.) Set builder
               - instead of putting elements on the set, the set builder uses description to represent the elements present inside the set.
Ex.  {x|x>16}
      (this time, we know that this set has the elements x, such that x that is greater than 16)
1 5 1
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