O

X

O

X

O

X

four-block

μ = 0

μ = 0

μ = 3

μ = 3

μ = 1, 2

μ = 1, 2

μ = 0

μ = 3

μ = 1, 2

W1β-A

+

0

0

0

0

0

+

0

W1β-B

0

+

+

0

0

+

0

W2α-A

0

0

0

0

0

±

+

0

W2α-B

0

+

0

0

±

+

0

W1α-C

0

+

+

0

0

±

0

W1α-D

+

0

0

0

0

0

±

0

W2β-C

0

+

0

0

0

W2β-D

0

0

0

0

0

0