question: If each image contains only an adult gorilla, and in one image the gorilla is sitting with an elbow on a bent knee.
#1 return gorillas 
#2 return #1 that are adult 
#3 return images 
#4 return number of  #2 for each  #3 
#5 return #3 where  #4 is equal to  one 
#6 return number of  #3 
#7 return number of  #5 
#8 return if  #6 is equal to  #7 
#9 return elbow of #1 
#10 return knee of #1 
#11 return #10 that is bent 
#12 return #9 that is on #11 
#13 return #1 that is sitting 
#14 return #13 that has #12 
#15 return if  #14 is in  one image  
#16 return if  both  #8 and #15 are true