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

return name of all of the courses

I don't know what is wrong with my code in the second challenge, my code will not pass

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_all(single_set):
    name = []
    topics = set(single_set)
    for x,y in COURSES.items():
        if topics[0] in y and topics[1] in y:
            name.append(x)
    return name        














def covers(set_topics):
    course = []
    for x,y in COURSES.items():
        if y.intersection(set_topics):
            course.append(x)
    return course