diff --git a/array_combination.ipynb b/array_combination.ipynb
index 33c6634..6f2d4c0 100644
--- a/array_combination.ipynb
+++ b/array_combination.ipynb
@@ -10,11 +10,11 @@
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": "a=set([1,2,3,4])\nb=set([4,5,6,7])\nc=set([7,8,9])",
+     "input": "a=set([3,4])\nb=set([3,7])",
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 5
+     "prompt_number": 112
     },
     {
      "cell_type": "code",
@@ -28,37 +28,26 @@
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": "def shuffle(*args):\n    combinations = [[i] for i in args[0]]\n    for arg in args[1:]:\n        tempcomb = []\n        for i in arg:\n            print i\n            tempcomb += [c+[i] for c in combinations if i not in c ]\n        combinations = tempcomb\n    return combinations\nshuffle(a,b,c)",
+     "input": "def array_combinations(*args):\n    combinations = [[i] for i in set(args[0])]\n    for arg in args[1:]:\n        tempcomb = []\n        for i in set(arg):\n            tempcomb += [c+[i] for c in combinations if i not in c ]\n        combinations = tempcomb\n    return combinations\nres = array_combinations(a,b)\nprint res\nprint len(res)",
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
-       "text": "4\n5\n6\n7\n8\n9\n7\n"
+       "text": "[[4, 3], [3, 7], [4, 7]]\n3\n"
       }
      ],
-     "prompt_number": 50
+     "prompt_number": 115
     },
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": "x= [2,4,3]\nx + 6",
+     "input": "",
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "ename": "TypeError",
-       "evalue": "can only concatenate list (not \"int\") to list",
-       "output_type": "pyerr",
-       "traceback": [
-        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-        "\u001b[1;32m<ipython-input-27-8c5a19772838>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m4\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m3\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mx\u001b[0m \u001b[1;33m+\u001b[0m \u001b[1;36m6\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
-        "\u001b[1;31mTypeError\u001b[0m: can only concatenate list (not \"int\") to list"
-       ]
-      }
-     ],
-     "prompt_number": 27
+     "outputs": [],
+     "prompt_number": 56
     },
     {
      "cell_type": "code",