question: If no image contains more than three stingray in the foreground, and no image contains other types of fish.
#1 return stingrays 
#2 return the  foreground 
#3 return #1 in  #2 
#4 return images of  #3 
#5 return number of #3 for each #4 
#6 return #4 where #5 is  higher than three 
#7 return number of #6 
#8 return if  #7 is  equal to zero 
#9 return fish 
#10 return #9 besides  #1 
#11 return images of  #10 
#12 return number of #11 
#13 return if  #12 is  equal to zero 
#14 return if  both  #8 and #13 are  true