Give the point group of
(a) A square-based pyramid;
(b) A right circular cone;
(c) A square lamina;
(d) A square lamina with the top and bottom sides painted different colors;
(e) A right circular cylinder;
(f) A right circular cylinder with the two ends painted different colors;
(g) A right circular cylinder with a stripe painted parallel to the axis;
(h) A snowflake;
(i) A doughnut;
(j) A baseball (Fig. 12.17); (k) a 2pz orbital;
(l) A human being (ignore internal organs and slight external left-right asymmetries).