The second exercise is to eliminate a single planet from your chart. The reason you might do this is to deal with a limiting belief or blockage in relation to the planet's energy. For example, if your Mars is retrograde in Cancer and opposite Saturn you might feel that accessing initiative and anger are difficult for you. Remove Mars, imagine that it doesn't exist in your chart. Just erase Mars from your chart, then search for initiative elsewhere.
Every planet holds a piece of the whole.
Even a marsles s person has the capacity to get the ball rolling. You can discover other layers in each planet by doing this. Take out the Moon and look for nurturance in the other planets. Drop Neptune and seek inspiration and compassion elsewhere. In this fashion you deepen your understanding of the planets, and of yourself.