gistfile1.txt

function pairElement(str) {
  arr = str.split('');
  arr2 = [];
  for (i = 0; i < arr.length-1; i++) { 
    for (k =1; k < arr.length; k++) { 
      if(arr[i] != arr[k]){
        arr2.push([arr[i],arr[k]]);
      }
    }
}
   for (i = arr.length-1; i >0 ; i--) { 
    for (k =arr.length-2; k >=0 ; k--) { 
      if(arr[i] != arr[k]){
        arr2.push([arr[i],arr[k]]);
      }
    }
}
  return arr2;
}

pairElement("GCG");