P:matrix([0,0,0,1/2,0,0,0,0,0,0,0,0,0,0,0],[1/2,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,1/2,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,1/2,0,0],[0,0,0,0,0,0,0,1,0,1/4,0,0,0,0,0],[0,0,0,0,0,0,0,0,1/2,0,0,0,0,1,0],[0,0,1/2,0,0,1,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,1/2,0,0,0,0,0],[0,0,0,0,0,0,1,0,0,0,0,1/2,0,0,0],[0,0,0,0,1/2,0,0,0,0,0,0,0,0,0,0],[0,1,0,1/2,0,0,0,0,0,1/4,0,0,0,0,0],[0,0,1/2,0,1/4,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],[0,0,0,0,0,0,0,0,0,0,0,1/2,0,0,0],[1/2,0,0,0,1/4,0,0,0,0,0,1,0,1/2,0,0])$