     "source": [
      "## Constraints\n",
      "\n",
      "* Are the stacks and array a fixed size?\n",
      "    * Yes"
     ]
    },
    {
 
</s> remove     "version": 2
 </s> add     "version": 3 </s> remove    "display_name": "Python 2",
 </s> add    "display_name": "Python 3", </s> remove    "name": "python2"
 </s> add    "name": "python3" </s> remove    "version": "3.4.3"
 </s> add    "version": "3.5.0"
    "    * Yes\n",
    "* Are the stacks equally sized?\n",
    "    * Yes\n",
    "* Does pushing to a full stack result in an exception?\n",
    "    * Yes\n",
    "* Does popping from an empty stack result in an exception?\n",
    "    * Yes\n",
    "* Can we assume the user passed in stack index is valid?\n",
     "source": [
      "## Constraints\n",
      "\n",
      "* Are the stacks and array a fixed size?\n",
    "    * Yes\n",
    "* Are the stacks equally sized?\n",
    "    * Yes\n",
    "* Does pushing to a full stack result in an exception?\n",
    "    * Yes\n",
    "* Does popping from an empty stack result in an exception?\n",
    "    * Yes\n",
    "* Can we assume the user passed in stack index is valid?\n",
      "    * Yes"
     ]
    },
    {
keep keep keep add keep keep keep keep
 Update constraints for n stacks challenge and solution (#71) 
stacks_queues/n_stacks/n_stacks_solution.ipynb