Did you ever notice that
What other such examples are there?
In [7]: nummaker = lambda x,y: 10*x+y
In [8]: nummakers = [lambda x,y: nummaker(x,y), lambda x,y: nummaker(y,x)]
In [9]: [(a,b,c,top(a,b), bottom(b,c)) for a in range(1,10) for b in range(1,10) for c in range(1,10) for top in nummakers for bottom in nummakers if top(a,b) != bottom(b,c) if top(a,b)*c == bottom(b,c)*a]