Owen entered the cellar. Mason entered the back yard. Ella entered the back yard. Owen exited the cellar. The lettuce is in the green container. Mason exited the back yard. Ella moved the lettuce to the blue suitcase.
Mason think that Ella searches for the lettuce in the green container.
 Mason think that Ella searches for the lettuce in the blue_suitcase
 Mason think that Ella searches for the lettuce in the green_container