Since the owners and the accuser are both too lazy to calculate the house edge, here it is (free of charge!):
Low Risker: 21.875% House Edge
-1*(1/16) + 0*(1/16) + -0.5*(1/16) + -1*(1/16) + 1*(1/16) + 0*(1/16) + -0.5*(1/16)+ 0.5*(1/16)+ -0.5*(1/16) +0*(1/16)+ -1*(1/16) + 1*(1/16) + -1*(1/16) + -0.5*(1/16) + -1 * (1/16) + 1*(1/16)