Not in list

function includes(item,list){
  for(var i = 0; i < list.length; i++){
    if(list[i] === item){
      return true;
    }
  }
  return false;
}

function Not_In_List(x){
  x = x.split("\n");
  var result = [];
  var i = 0;

  for(; i < x.length; i++){
    if(!includes(x[i],result)) result.push(x[i]);
  }
  return result.join("\n");
}