Why I get the Bummer! if the function is returning a list with all the courses?

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
dictionary = {'Andrew Chalkley': ['jQiery Basics', 'Node.js Basics'], 'Kennetg Love': ['Python Basics', 'Python Collections']}
key_list = []
value_list = []

def num_teachers(dictionary):
    for key in dictionary.keys():
        key_list.append(key)
    return len(key_list)

def num_courses(teachers_dict):
    count = 0
    for teacher in teachers_dict:
        count = count + len(teachers_dict[teacher])
    return count

def courses(dictionary):
    for value in dictionary.values():
        value_list.append(value[0])
        value_list.append(value[1])
    return value_list
print(courses(dictionary))