question: If one of the images in the pair contains a lone seal without any penguins.
#1 return seals 
#2 return images of #1 
#3 return number of  #1 for each  #2 
#4 return #2 where  #3 is equal to  one 
#5 return penguins in  #4 
#6 return number of  #5 for each  #4 
#7 return #4 where  #6 is equal to  zero 
#8 return number of  #7 
#9 return if  #8 is equal to  one