text: /*
  Your task is to remove all duplicate words from a string, leaving only single (first) words entries.
  
  Example:
  
  Input:
  
  'alpha beta beta gamma gamma gamma delta alpha beta beta gamma gamma gamma delta'
  
  Output:
  
  'alpha beta gamma delta'
  
   */
  
  function removeDuplicateWords(s) {
  	let str = s.split(' ');
  	return [...new Set(str)].join(' ');
  }
  