diff --git a/.vscode/settings.json b/.vscode/settings.json
index 2369810..0dde038 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -17,8 +17,25 @@
   "files.autoSave": "afterDelay",
   "screencastMode.onlyKeyboardShortcuts": true,
   "terminal.integrated.fontSize": 18,
-  "workbench.activityBar.visible": true,
   "workbench.colorTheme": "Visual Studio Dark",
   "workbench.fontAliasing": "antialiased",
-  "workbench.statusBar.visible": true
-}
+  "workbench.statusBar.visible": true,
+  "MicroPython.executeButton": [
+    {
+      "text": "▶",
+      "tooltip": "Run",
+      "alignment": "left",
+      "command": "extension.executeFile",
+      "priority": 3.5
+    }
+  ],
+  "MicroPython.syncButton": [
+    {
+      "text": "$(sync)",
+      "tooltip": "sync",
+      "alignment": "left",
+      "command": "extension.execute",
+      "priority": 4
+    }
+  ]
+}
\ No newline at end of file
diff --git a/02/02_02/02_02b/main.py b/02/02_02/02_02b/main.py
index 8aca3e1..76364f9 100644
--- a/02/02_02/02_02b/main.py
+++ b/02/02_02/02_02b/main.py
@@ -2,3 +2,14 @@
 Problem Statement: Compute the average number of pets each student 
 has in a given class. 
 '''
+student_pet_cnt = [0,1,2,3,4,0,3,2,1,0,0,3,2,1,0,0,2]
+
+number_of_students = len(student_pet_cnt)
+
+print(number_of_students)
+
+sum = 0
+for count in student_pet_cnt:
+  sum = sum + count
+print(sum)
+print(sum/len(student_pet_cnt))
\ No newline at end of file
diff --git a/02/02_05/02_05b/main.py b/02/02_05/02_05b/main.py
index fbdc20f..a10a773 100644
--- a/02/02_05/02_05b/main.py
+++ b/02/02_05/02_05b/main.py
@@ -4,3 +4,4 @@
     ["Katherine", "Lauren", "Mary", "Nathan", "Olive"],
     ["Chad", "April", "Matt", "Thomas", "Penny"]
 ]
+print(seating_chart[2][1])
\ No newline at end of file
diff --git a/02/02_09/02_09b/main.py b/02/02_09/02_09b/main.py
index 7b9b5fa..4551836 100644
--- a/02/02_09/02_09b/main.py
+++ b/02/02_09/02_09b/main.py
@@ -1,4 +1,21 @@
 def find_second_smallest(my_list):
-    return 0
+    if len(my_list) <= 1:
+        return None
+    else:
+        smallest = float('inf')
+        second_smallest = float('inf')
+        
+    for item in my_list:
+        if item < smallest:
+                second_smallest = smallest
+                smallest = item
+        elif item < second_smallest:
+                second_smallest = item
+    return second_smallest       
+
+            
+                
 
 print(find_second_smallest([5, 8, 3, 2, 6]))
+print(find_second_smallest([5]))
+print(find_second_smallest([5, 3, 3, 2, 6]))
\ No newline at end of file
diff --git a/03/03_02/03_02b/main.py b/03/03_02/03_02b/main.py
index 38e1a25..0598faf 100644
--- a/03/03_02/03_02b/main.py
+++ b/03/03_02/03_02b/main.py
@@ -1,2 +1,7 @@
 # Key: State
 # Value: Capital
+state = {
+  'fl': 'tl', 'al':'tsk'
+}
+
+print(state.keys())
\ No newline at end of file
diff --git a/03/03_04/03_04b/main.py b/03/03_04/03_04b/main.py
index b5a35fb..0322164 100644
--- a/03/03_04/03_04b/main.py
+++ b/03/03_04/03_04b/main.py
@@ -8,7 +8,13 @@
 
 
 def update_preferences(user_pref):
-    return {}
+    new_user_prefs = {}
+    for key, value in user_pref.items():
+        if value != None:
+            new_user_prefs[key] = value
+           
+   
+    return new_user_prefs
 
 
 print(update_preferences(user_preferences))
diff --git a/04/04_03/04_03b/main.py b/04/04_03/04_03b/main.py
index afc5a1c..148ba30 100644
--- a/04/04_03/04_03b/main.py
+++ b/04/04_03/04_03b/main.py
@@ -1,2 +1,4 @@
 set_A = {10, 20, 30, 40, 50}
 set_B = {30, 40, 50, 60, 70}
+
+print(set_A.union(set_B))
\ No newline at end of file
diff --git a/04/04_05/04_05b/main.py b/04/04_05/04_05b/main.py
index 5264285..8260470 100644
--- a/04/04_05/04_05b/main.py
+++ b/04/04_05/04_05b/main.py
@@ -1,6 +1,8 @@
 def has_unique_characters(data):
-    return False
-
+    data_set = set(data)
+    return len(data_set) == len(data)
+    
+    
 print(has_unique_characters('sample'))
 print(has_unique_characters('hello world'))
 print(has_unique_characters('linkedin'))
diff --git a/05/05_04/05_04b/main.py b/05/05_04/05_04b/main.py
index e69de29..f191dab 100644
--- a/05/05_04/05_04b/main.py
+++ b/05/05_04/05_04b/main.py
@@ -0,0 +1,16 @@
+from collections import deque
+''' 0001
+    0010
+    0011
+    0100
+    0101
+    1101
+    0111
+    1000
+    1001
+'''
+
+def print_bin_num(a):
+  if a <= 0:
+    return None
+  
\ No newline at end of file
diff --git a/06/06_05/06_05b/main.py b/06/06_05/06_05b/main.py
index e69de29..d59b503 100644
--- a/06/06_05/06_05b/main.py
+++ b/06/06_05/06_05b/main.py
@@ -0,0 +1,21 @@
+from collections import deque
+
+def matching_para(text):
+  stack = deque()
+  for char in text:
+   if char == '(':
+     stack.append(char)
+     
+   elif char == ')':
+     if not stack:
+       return False
+     stack.pop()
+     
+    
+  
+  return len(stack) == 0  
+      
+    
+      
+  
+print(matching_para(')(hi )there)('))