question: If an image includes three zebras standing in a row and gazing forward, with a fourth zebra behind them.
#1 return zebras 
#2 return #1 standing in  a  row 
#3 return #2 that are gazing forward 
#4 return number of  #3 
#5 return if  #4 is three 
#6 return #1 behind #3 
#7 return number of  #6 
#8 return if  #7 is one 
#9 return if  both  #5 and #8