question: If in at least one image there is a single purple headed crab crawling in the ground.
#1 return crabs 
#2 return head of #1 
#3 return #1 where  #2 is purple 
#4 return the  ground 
#5 return #3 crawling in  #4 
#6 return images of #5 
#7 return number of  #5 for each  #6 
#8 return #6 where  #7 is equal to  one 
#9 return number of  #8 
#10 return if  #9 is at least one