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# my function returns the right answers, why won't it pass the challenge?

i've tried a couple different methods, like converting the argument into a set by dong this:

a_set = {a_set}

but then if you pass in an actual set into the function and error shows up...

what to do...what to do?

i want a function that takes 1 set a paramater, and returns a list of courses whose values overlap with the given set parameter.

so first i created an empty list. then my next step was to go through each course now while looping through the course i want to check to see if the set of values of that course match with the given set. if it is a match add that course to my overlapping_course list. once the loop is complete show me the list

after checking my work i get bummer try again..

so it makes sense to me what am i missing? im excited i got this far by myself excitied to hear answers thank you very much!

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(a_set):
overlapping_courses = []
for x in COURSES:
if a_set.intersection(COURSES[x]):
overlapping_courses.append(x)
return overlapping_courses
```