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Jan 12th, 2017
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  1. ;var arr = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
  2. var arr2 = [];
  3.  
  4. var i, j = -1;
  5. var str;
  6.  
  7. for(i = 0; i < arr.length; i++) {
  8.     str = "";
  9.     if(j >= 0)
  10.         str += arr[j];
  11.    
  12.     str += arr[i];
  13.     arr2.push(str);
  14.    
  15.     if(i === arr.length - 1) {
  16.         j++;
  17.         i = -1;
  18.     }
  19.    
  20.     if(j === arr.length)
  21.         break;
  22. }
  23.  
  24. console.log(JSON.stringify(arr2));
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