c = {}
j[2] = 2
j[7] = 6
j[5] = 1
j[3] = 4
j[4] = 3
for j in c:
del c[j]
print(len(j))

From my own understanding is that len equates to 4, since when you count "0...1...2", the place value is 4. But it also wants you to delete j which should delete every key value pair that is j. But, this gives my 17 and I tried getting an anwser close to that only to get 16. Would be greatly appreciated if someone broke this down for me :)