snippet of python

def compare_it(a,b):
    comp0=cmp(a[0],b[0])
    comp1=cmp(a[1],b[0])
    comp2=cmp(a[1],b[1])

    if comp0 == 0:
        return a,b,(a[0],b[0])
      
    elif comp1==0:
        return a,b,(a[1],b[0])
       
    elif comp2==0:
        return a,b,(a[1],b[1])
        

b1=[[0,0],[1,0]]
b2=[[1,1],[1,0]]
b3=[[1,1],[0,1]]
b4=[[0,0],[0,1]]