al aligned (y): y
u1 aligned (n): n
u2 aligned (n): n
u3 aligned (n): n

al plus1 (n): n
u1 plus1 (y): y
u2 plus1 (n): n
u3 plus1 (n): n

al plus2 (n): n
u1 plus2 (n): n
u2 plus2 (y): y
u3 plus2 (n): n

al plus3 (n): n
u1 plus3 (n): n
u2 plus3 (n): n
u3 plus3 (y): y

