    },
    "language_info": {
     "codemirror_mode": {
      "name": "ipython",
      "version": 2
     },
     "file_extension": ".py",
     "mimetype": "text/x-python",
     "name": "python",
     "nbconvert_exporter": "python",
 
</s> remove     "version": 2
 </s> add     "version": 3 </s> remove    "pygments_lexer": "ipython2",
   "version": "2.7.10"
 </s> add    "pygments_lexer": "ipython3",
   "version": "3.4.3" </s> remove    "pygments_lexer": "ipython2",
   "version": "2.7.10"
 </s> add    "pygments_lexer": "ipython3",
   "version": "3.4.3" </s> remove    "name": "python2"
 </s> add    "name": "python3" </s> remove    "name": "python2"
 </s> add    "name": "python3"
    "version": 3
    },
    "language_info": {
     "codemirror_mode": {
      "name": "ipython",
    "version": 3
     },
     "file_extension": ".py",
     "mimetype": "text/x-python",
     "name": "python",
     "nbconvert_exporter": "python",
keep keep keep keep replace keep keep keep keep keep
 Polish selection sort challenge and solution 
sorting_searching/selection_sort/selection_sort_challenge.ipynb