How would the answer be 7

Question

I had contribute in a challenge
Don't know how would the true answer be 7 instead 6

s1=frozenset([0,1,1])
s2=frozenset([1,2,3,3,2])
s3={s1,s2}
total=0
for e in s3:
total += sum(e)
print(total)

Answer 1

You are right. Counted the states