var foundDifference = false;
  var i = 0, j = 0;

while (i < small.length && j < large.length){

  if (small[i] != large[j]){
    if (foundDifference){
      return false;
    }
    foundDifference = true;

    if (small.length == large.length){
      i ++;
    }
  }
  else{
      i ++;
    }
  j ++;
}