Six Primes: IV. 7-6-5-4

1 Six Primes: I. 13-7-6-4
2 Six Primes: II. 11-7-6-4
3 Six Primes: III. 13-6-5-4
4 Six Primes: IV. 7-6-5-4
5 Six Primes: V. 13-11-8-6
6 Six Primes: VI. 11-5-4-3