question: If an image shows one person behind three white dogs.
#1 return images 
#2 return people in  #1 
#3 return dogs in  #1 
#4 return #3 that are white 
#5 return #2 behind #4 
#6 return number of  #4 for each  #5 
#7 return #5 where  #6 is equal to  three 
#8 return number of  #7 for each  #1 
#9 return #1 where  #8 is equal to  one 
#10 return number of  #9 
#11 return if  #10 is equal to  one