diff --git a/stacks_queues/stack_min/stack_min_solution.ipynb b/stacks_queues/stack_min/stack_min_solution.ipynb
index 55ceba5..8c263d5 100644
--- a/stacks_queues/stack_min/stack_min_solution.ipynb
+++ b/stacks_queues/stack_min/stack_min_solution.ipynb
@@ -77,7 +77,7 @@
     "### Push\n",
     "\n",
     "* Push the data\n",
-    "* If the data is less than min\n",
+    "* If the data is equal or less than min\n",
     "    * Push data to second stack\n",
     "\n",
     "Complexity:\n",
@@ -105,7 +105,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -116,7 +116,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -139,7 +139,7 @@
     "\n",
     "    def push(self, data):\n",
     "        super(StackMin, self).push(data)\n",
-    "        if data < self.minimum():\n",
+    "        if data <= self.minimum():\n",
     "            self.stack_of_mins.push(data)\n",
     "\n",
     "    def pop(self):\n",
@@ -159,19 +159,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Overwriting test_stack_min.py\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "%%writefile test_stack_min.py\n",
     "from nose.tools import assert_equal\n",
@@ -188,6 +180,9 @@
     "        stack.push(1)\n",
     "        assert_equal(stack.peek(), 1)\n",
     "        assert_equal(stack.minimum(), 1)\n",
+    "        stack.push(1)\n",
+    "        assert_equal(stack.peek(), 1)\n",
+    "        assert_equal(stack.minimum(), 1)\n",
     "        stack.push(3)\n",
     "        assert_equal(stack.peek(), 3)\n",
     "        assert_equal(stack.minimum(), 1)\n",
@@ -201,6 +196,8 @@
     "        assert_equal(stack.pop(), 3)\n",
     "        assert_equal(stack.minimum(), 1)\n",
     "        assert_equal(stack.pop(), 1)\n",
+    "        assert_equal(stack.minimum(), 1)\n",
+    "        assert_equal(stack.pop(), 1)\n",
     "        assert_equal(stack.minimum(), 5)\n",
     "        assert_equal(stack.pop(), 5)\n",
     "        assert_equal(stack.minimum(), sys.maxsize)\n",
@@ -222,22 +219,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Test: Push on empty stack, non-empty stack\n",
-      "Test: Pop on non-empty stack\n",
-      "Test: Pop empty stack\n",
-      "Success: test_stack_min\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "run -i test_stack_min.py"
    ]
@@ -259,9 +245,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.0"
+   "version": "3.7.0b4"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
+ "nbformat_minor": 2
 }
diff --git a/stacks_queues/stack_min/test_stack_min.py b/stacks_queues/stack_min/test_stack_min.py
index 630fb1c..579b52a 100644
--- a/stacks_queues/stack_min/test_stack_min.py
+++ b/stacks_queues/stack_min/test_stack_min.py
@@ -1,4 +1,3 @@
-import sys
 from nose.tools import assert_equal
 
 
@@ -13,6 +12,9 @@ class TestStackMin(object):
         stack.push(1)
         assert_equal(stack.peek(), 1)
         assert_equal(stack.minimum(), 1)
+        stack.push(1)
+        assert_equal(stack.peek(), 1)
+        assert_equal(stack.minimum(), 1)
         stack.push(3)
         assert_equal(stack.peek(), 3)
         assert_equal(stack.minimum(), 1)
@@ -26,6 +28,8 @@ class TestStackMin(object):
         assert_equal(stack.pop(), 3)
         assert_equal(stack.minimum(), 1)
         assert_equal(stack.pop(), 1)
+        assert_equal(stack.minimum(), 1)
+        assert_equal(stack.pop(), 1)
         assert_equal(stack.minimum(), 5)
         assert_equal(stack.pop(), 5)
         assert_equal(stack.minimum(), sys.maxsize)