setx = set(["apple", "mango"])
sety = set(["mango", "orange"])
setz = set(["mango"])
issubset = setx <= sety
print(issubset)
issuperset = setx >= sety
print(issuperset)
issubset = setz <= sety
print(issubset)
issuperset = sety >= setz
print(issuperset)