this one uses the Set() and String() constructors, and more

kata link: https://www.codewars.com/kata/56abc5e63c91630882000057/javascript

Set() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/Set
String() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/String
spread syntax (…) info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
size accessor property info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/size

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