-----------------------+----+----+----+----+----+----+----+----+----+-----
   True Prime Pairs Δ    |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 | Sum 
  =======================+====+====+====+====+====+====+====+====+====+=====
   19 → π(10)            |  2 |  3 |  5 |  7 |  - |  - |  - |  - |  - | 4th  4 x Root
  -----------------------+----+----+----+----+----+----+----+----+----+-----
   17 → π(20)            | 11 | 13 | 17 | 19 |  - |  - |  - |  - |  - | 8th  4 x Twin
  -----------------------+----+----+----+----+----+----+----+----+----+-----
   13 → π(30) → 12 (Δ1)  | 23 | 29 |  - |  - |  - |  - |  - |  - |  - |10th
  =======================+====+====+====+====+====+====+====+====+====+===== 1st Twin