grind_rate = [ [ 100, 0, 0, 0, 0, 0, 0, 0, 0,], [ 35, 25, 25, 15, 0, 0, 0, 0, 0,], [ 30, 20, 20, 15, 10, 5, 0, 0, 0,], [ 25, 15, 15, 15, 10, 8, 6, 3, 3,],]