A ()xyz   # Return it
b (x)yz   # Fails: 0==begin(A) < begin(b)==0
c (xy)z   # Fails: 0==begin(A) < begin(c)==0
d (xyz)   # Fails: 0==begin(A) < begin(d)==0
E x()yz   # Return it
f x(y)z   # Fails: 1==begin(E) < begin(f)==1
g x(yz)   # Fails: 1==begin(E) < begin(g)==1
H xy()z   # Return it
i xy(z)   # Fails: 2==begin(H) < begin(i)==2
J xyz()   # Return it