question: If in one of the pictures of the pair, a red vending machine stands between a white machine and a black machine.
#1 return vending machine  
#2 return #1 that is red 
#3 return #1 that is white 
#4 return #1 that is black 
#5 return #2 that stands between both  #3 and #4 
#6 return if  #5 is in  one of the  pictures