question: If one basin is square and one is round.
#1 return basins 
#2 return #1 that are square 
#3 return #1 that are round 
#4 return number of  #2 
#5 return number of  #3 
#6 return if  #4 is equal to  one 
#7 return if  #5 is equal to  one 
#8 return if  both  #6 and #7 are true