Carla is passing out red, white, and blue construction paper for an art project. There are twelve people in her group and twelve pieces of paper. Carla, who likes to show off, tells everybody to watch closely as she hands out the paper. The first person gets the red paper. Carla puts the second paper at the bottom of the stack. She gives the second person a white paper. Carla puts the fourth paper at the bottom of the stack. She gives the third person a blue paper. The next paper goes to the bottom of the stack. Carla continues this pattern until there is no more paper. How did she have to stack the colored paper so that she could pass it out this way?