     ]
    },
    {
     "cell_type": "code",
     "execution_count": 14,
     "metadata": {
      "collapsed": false
     },
     "outputs": [],
     "source": [
 
</s> remove    "execution_count": 16,
 </s> add    "execution_count": 7, </s> remove    "execution_count": 15,
 </s> add    "execution_count": 5,
   "execution_count": 4,
     ]
    },
    {
     "cell_type": "code",
   "execution_count": 4,
     "metadata": {
      "collapsed": false
     },
     "outputs": [],
     "source": [
keep keep keep keep replace keep keep keep keep keep
 New test case to illustrate the improvements 
arrays_strings/compress/compress_solution.ipynb