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.
The tangerine at the beginning was in the red treasure chest.
 the tangerine at the beginning was in the blue_suitcase
 the tangerine at the beginning was in the red_treasure_chest