D 4 - d 2 - d 2 July 8, 2019 16 32 64 128 Pi 4 d 2 d 2 Π 4 d 2 d 2 4 d 2 2 d 3 D 1 2 d 1 2 d 2 4 2 4 - d D 3 - d 2 - d 4
