question: If one sailboat has its sails furled and the other has sails unfurled.
#1 return sailboats 
#2 return sails  of  #1 
#3 return #1 where #2 is  furled 
#4 return #1 where #2 is  unfurled 
#5 return number of #3 
#6 return number of #4 
#7 return If #5 is  equal to one 
#8 return If #6 is  equal to one 
#9 return If both  #7 and #8 are  true