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)  