question: If an image contains exactly one vivid purple upright water bottle.
#1 return images 
#2 return water bottles in  #1 
#3 return #2 that are upright 
#4 return #3 that are vivid purple 
#5 return number of  #4 for each  #1 
#6 return #1 where  #5 is equal to  one 
#7 return number of  #6 
#8 return if  #7 is equal to  one