Can someone explain this python dict code?

Question

primes = {1: 2, 2: 3, 4: 7, 7:17}
print(primes[primes[4]])
ok = {1:2,2:3,3:4,4:5}#17
print(ok[ok[3]]) #prints 5

Answer 1

FADE

primes[4] = 7

primes[primes[4]]
= primes[7]
= 17

ok[3] = 4

ok[ok[3]] = ok[4] = 5

Answer 2

🅰🅹 (Challenge Accepted) but how does ok[3] = to 4 and how does primes[7] = 17?

Answer 3

FADE

It's a dictionary in which key 4 have value 7 and key 7 have value 17

So primes [4] = 7

And now primes[7] will be 17

Same for ok[3]