August 2002

y = (2 + cos(u+2pi/3)) cos(2pi/3+v)^{2} sin(2pi/3+v)^{2}

z = -(2 + cos(u-2pi/3)) cos(2pi/3-v)^{2} sin(2pi/3-v)^{3}

0 <= u <= 2 pi, 0 <= v <= 2 pi