Mila entered the staircase. Oliver entered the staircase. The tangerine is in the red treasure chest. Mila moved the tangerine to the blue suitcase. Oliver exited the staircase.
Oliver think that Mila searches for the tangerine in the blue suitcase.
 Oliver think that Mila searches for the tangerine in the red_treasure_chest
 Oliver think that Mila searches for the tangerine in the blue_suitcase