i

j

P1

P2

P3

P4

B1

(1, 2, 3)

(0, 1, 2)

(2, 3, 4)

(0, 2, 4)

B2

(1, 2, 3)

(0, 1, 2)

(2, 3, 4)

(0, 2, 4)

B3

(1, 2, 3)

(0, 1, 2)

(2, 3, 4)

(0, 2, 4)

B4

(1, 2, 3)

(0, 1, 2)

(2, 3, 4)

(0, 2, 4)