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Python Python Collections (2016, retired 2019) Sets Set Math

Hi I can't seem to solve this problem. Appreciate if you can see whats wrong with my code. Thanks!

def covers(x):

courselist = []
module = set(x)

modules = set([COURSES.values()])

for k in COURSES:
    if modules.issuperset(module):
        courselist.append(k)
return courselist
sets.py
COURSES = {
    "Python Basics": {"Python", "functions", "variables",
                      "booleans", "integers", "floats",
                      "arrays", "strings", "exceptions",
                      "conditions", "input", "loops"},
    "Java Basics": {"Java", "strings", "variables",
                    "input", "exceptions", "integers",
                    "booleans", "loops"},
    "PHP Basics": {"PHP", "variables", "conditions",
                   "integers", "floats", "strings",
                   "booleans", "HTML"},
    "Ruby Basics": {"Ruby", "strings", "floats",
                    "integers", "conditions",
                    "functions", "input"}
}


def covers(x):
    #print(COURSES.values())
    courselist = []
    module = set(x)
    #print (module)
    modules = set([COURSES.values()])
    #print (modules)
    for k in COURSES:
        if modules.issuperset(module):
            courselist.append(k)
    return courselist