M 4 7m 2 1 July 8, 2019 16 32 64 128 M 4 7m 2 12 M 4 7m 2 18 0 M 6 7m 4 18m 2 X 2 m 4 x m 2 7m 12 0 Factor m 6 7m 4 18m 2 M/-7 2