4SB 0.16^4          = 0.00065536.
3SB 4x0.16^3x0.84   = 0.01376256.
2SB 6x0.16^2x0.84^2 = 0.10838016.
1SB 4x0.16x0.84^3   = 0.37933056.
0SB 0.84^4          = 0.49787136.