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let strArray = [ "q", "w", "w", "w", "e", "i", "u", "r"];
let findDuplicates = (arr) => 
arr.filter((item, index) => 
{
  return arr.indexOf(item) == index // this will get the first possible occurance,so all time it will be unique,
  // so it will only be get once
  
}
)


console.log(findDuplicates(strArray)) // All duplicates