question: If each set shows two dogs that are similar in age, coloring, style, and look.
#1 return sets 
#2 return dogs in  #1 
#3 return age of #2 
#4 return coloring of #2 
#5 return style of #2 
#6 return look of #2 
#7 return #2 where  #3 is similar 
#8 return #2 where  #4 is similar 
#9 return #2 where  #5 is similar 
#10 return #2 where  #6 is similar 
#11 return #2 in  both  #7 and #8 
#12 return #2 in  both  #9 and #10 
#13 return #2 in  both  #11 and #12 
#14 return number of  #13 for each  #1 
#15 return #1 where  #14 is equal to  two 
#16 return number of  #15 
#17 return number of  #1 
#18 return if  #16 is equal to  #17