1. cake
   1. flour
   2. eggs
   3. milk
   4. butter
      1. oil
2. 4 Ps
   1. Product
      1. what
   2. Place
      1. where
         1. area
         2. store
         3. location
            1. store
   3. Price
      1. cost
         1. profit
   4. Promotion
      1. tell