diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..38734ca
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diff --git a/__pycache__/assignment_2b.cpython-39.pyc b/__pycache__/assignment_2b.cpython-39.pyc
new file mode 100644
index 0000000..4af1305
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diff --git a/__pycache__/assignment_2c.cpython-39.pyc b/__pycache__/assignment_2c.cpython-39.pyc
new file mode 100644
index 0000000..eab2203
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diff --git a/assignment_1.py b/assignment_1.py
index 166ef54..48f6927 100644
--- a/assignment_1.py
+++ b/assignment_1.py
@@ -16,6 +16,7 @@ def lower_case(string):
     """
 
     ### your code starts here
+    lower_string = string.lower()
 
     ### your code ends here
 
diff --git a/assignment_2a.py b/assignment_2a.py
index 529aceb..c33869f 100644
--- a/assignment_2a.py
+++ b/assignment_2a.py
@@ -8,12 +8,14 @@
 Run the script to see if you succeeded! PS: Multiple combinations are possible,
 just give a correct one.
 """
+help(function_2b)
+help(function_2c)
 
-var_1 = function_2b(...)
+var_1 = function_2c(1000, 5, -5, 50)['subtract']
 
-var_2 = function_2c(...)
+var_2 = function_2b('Seminars', 'Borrel')['C']
 
-var_3 = str(function_2b(...)) + function_2c(...)
+var_3 = str(function_2c(5, 10, 1000, 5)['multiply']) + function_2b('CLs', 'borrel')['L']
 
 if var_1 == 950:
     print("Good job!")
diff --git a/assignment_2b.py b/assignment_2b.py
index 1aef416..25861b3 100644
--- a/assignment_2b.py
+++ b/assignment_2b.py
@@ -5,7 +5,7 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2b(string_1, string_2):
-
+    ''' the function results in the first string in lower case, the second strong in upper case and then both of them combined. '''
     lower = string_1.lower()
     upper = string_2.upper()
     combined = string_1 + string_2
diff --git a/assignment_2c.py b/assignment_2c.py
index 1ac1ced..047c565 100644
--- a/assignment_2c.py
+++ b/assignment_2c.py
@@ -5,7 +5,7 @@
 No cheating! Don't show or tell hem the code directly
 """
 def function_2c(w, x, y, z):
-
+    '''this function multiplies the 2nd and 3rd input, divides the 2nd and 3rd input, adds the 1st and 4th input, and subtracts the 4th from the 1st input '''
     multiplication = x * y
     division = x / y
     addition = w + z