The Binhai Municipal Government decided to launch a landscaping project. Based on the research and demonstration, the relevant government departments made the following decisions on the selection of characteristic tree species: (1) at least the same choice of camphor and willow; (2) if not planting laurel Tree, then you need to plant cedar; (3) if you willow tree, then you need to plant a peach tree; (4) peach tree, at least the same as a cedar tree. Based on this, what kind of characteristic tree species can be introduced in the city? ['Willow or Peach.', 'camphor or laurel.', 'Cedar or willow.', 'Cedar or camphor tree.']